Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba1838464edeb1f…

MALICIOUS

PDF

105.5 KB Created: 2021-07-25 04:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7993cd1c625a26c43cfd11c268112ae SHA-1: bb4808846862cfda3d69f39341d4cd0b22b2b11e SHA-256: fba1838464edeb1f6076a5a18189dd058a810c6cdf8181004350256a7d872daf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is designed to host and distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • 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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39ecbc51d---82557502189.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nqh65o6koce15ikmiefjb1v285/60428157247.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/bowumazikitodo.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/wuwutefojed.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/35167077029.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7308515e---96581666161.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/10298202193.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa67780ef9---bilomonejilezikobefukatu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/89705af1a165da08785e2bd35f3c9dc7/xeveboradadutegilixozidal.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/2ec6jjfrncfmleejjsemsuivht/22933766838.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58dbbe926---wedogo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dafa8r1hsvoeec528ga6cqav35/69032805443.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/25171dcc3fe86d6ff98b8dafc66fce98/4870392457.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/96445573727.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cef9a8a03---pifibivodikulinaxub.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/zubaxebegoninon.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b563f255b13---witomaledisufig.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///85728528663.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/64120640432.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/79863140592.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3e9aac1d---kemapawesamuxebaduwani.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/99971573491.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/zawotaludumuga.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/podowoxofak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=java+jdk+free+download+for+windows+7+32+bit+full+versionPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 18544 bytes
SHA-256: 289c0d03a7a24293f68dabb9b09d780cd5326b12af0ad345e8eb5d207d1eaa09
font_01_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672C 11292 bytes
SHA-256: 30d440c1212987e62b4dd8a4c68ec0056854027353fa96c41e25576e6a4fcbdc
font_03_sfnt_off000181f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F6 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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