Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3236c82932d89a…

MALICIOUS

PDF

410.7 KB Created: 2021-08-15 08:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfebba305a1721ed1f9484bbde6c0039 SHA-1: e3f32552d9421eb95730360cbfe392f1f3f5528d SHA-256: 8b3236c82932d89aefe442eab840d98dc4fae505c7ff943c1971ef02d8645317
306 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1027 Obfuscated Files or Information

This PDF document exhibits multiple high-risk heuristics indicative of a phishing or credential harvesting campaign. It contains links to compromised CMS uploads and algorithmically generated URLs, suggesting an attempt to host malicious content. The document explicitly instructs users to disable security software and requests sensitive recovery secrets or MFA confirmations, aligning with credential phishing tactics. While no scripts were directly extracted, the presence of these lures and the ML classifier's detection strongly suggest a malicious intent to deceive users and potentially steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8562

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=comptia+cloud+essentials+certification+study+guide+pdf PDF link annotation
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/521ekjf0uopbpra2m15vvqtc65/67716256474.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/mejevolapu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a53af41086b00324d409301a32c79c63/948850702.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889eef74f89---dumuwemogemu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/94723869760.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8036f8e3a0779aad6434061acea6fe61/61189307601.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/76441778200.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/putivuzisadefikinudowuna.pdfIn PDF document text
    • https://nyig.com/files/file/vezogiju.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/77074881756.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/50363642210.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160832b07678d2---buwegalafuxezigisiwegi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9d756b95---zekiripuzeraluge.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/tabolajubasoko.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0992c2c07cad5067feed3831a6632556/87823233560.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/tefuk.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6812fee6---pafer.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a784305136c66da798f8b04d53698ea6/14582150381.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e18aab680c7c7ec41cab8b57c005f069/5197423710.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160db3764e2cd7---vamasasexoduzeludum.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/rufosuduwetotiz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1212009db506f90bade538ca5b16da44/vuwisezosupilolidunov.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/gozusewozogoneziwowopok.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e7a29384---45647143610.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBC7 19436 bytes
SHA-256: cbf57bf36d7106a01e62644705f83aa4ff71d39620bef53128f8bffd586f03ae
font_01_sfnt_off00060f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000627a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627A2 11208 bytes
SHA-256: f49035804ffc77b65ad66a983693b99ff17c5e72ab777372fe8da8e8f31b3788
font_03_sfnt_off000641b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641B5 16192 bytes
SHA-256: 7ec5ec16bcc664b5692d831486f25dbcbe9d95bc2d396c734f04f6c2e1f1c176

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