Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f81eb04788a42c…

MALICIOUS

PDF

83.9 KB Created: 2021-08-22 02:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7936fd4d2c7953bf1759071d91cc902 SHA-1: b2992e3cf00b1d94ff860fe54a1496e05753558d SHA-256: a7f81eb04788a42c7146f211620e85b28a0c9369a7956ae60c0adffd1a20a174
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of a phishing lure, specifically targeting multi-factor authentication or one-time codes. The document contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect the user to a malicious site for credential harvesting. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=how+do+i+restore+my+ps+vita+to+factory+settings PDF link annotation
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a305daad2cc30fe111115cb6cbfe15f3/veguk.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/e24gl2vtfsvau2p1ad1cldjtbe/letodolilekaxapepuvos.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f6d2a8e5---soxogatebipifexozofip.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/55313260686.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cbc8b64b---80715013354.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ef2c86503---kurubegaxurema.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/47724867235.pdfIn PDF document text
    • http://metallpress.info/files/pijem.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/98434885931.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8170255a1---89475883939.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/143268e1b45af8c3305447f25cb107f7/34339802543.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f54mi805pjp48c7e4fgj1v85j3/95857552526.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/87212313740.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a3929c5---fixasovomuzinosune.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/27kgfr9nuntothd9ceocp07mts/kajowiwezibetorebizab.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa74b1fdf2b58152be5cf132d9a45dfa/doverap.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a629fb23bbd---fujelodakejupafo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d967585f416---pajuges.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddf1c51c8ba5fc9d1935865660e19fa5/bepufukobezuwuvabosubu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/56b9005356ac78ee60b09bce52e4889c/kogozurigalunujotezes.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/surigigugosasovufowo.pdfIn PDF document text
    • https://blv.by/upload/editor/files/64971122038.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/54417241475.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/bazax.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8acca1948---31961703555.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 11176 bytes
SHA-256: 2d56ac0bbbf8e93f6a62c8cbcbb8706095c21a89b2fa96f4f51d535d527fcaee
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 17896 bytes
SHA-256: fe3de1d1c0addded3d82b1ed16cbe5e387db3e9c9661cc69588a7b2f4b160773
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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