Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c96a6e363bb9e5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 14:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 733db9a824751b91e82ad870f4852dbd SHA-1: 5f91cfb898d4e49bd01209e5eca46d8f55960cb5 SHA-256: 01c96a6e363bb9e5d4db066631c278f9683519feb25602517eab59bb9706a7f4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous links to external domains, many of which appear to be part of a link farm hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. While no scripts were extracted, the overall structure and URL patterns indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3528

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=novelas+romanticas+historicas+gratis+pdf PDF link annotation
    • http://ping-property.com/user_img/files/35649137846.pdfIn PDF document text
    • https://hirurgija.me//files/1407125525.pdfIn PDF document text
    • http://palami.by/images/file/61391964396.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953f68bae57---tezuruluxukasefukunov.pdfIn PDF document text
    • http://e-district.org/userfiles/file/lexokuzasisavuvazur.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/busobug.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a54f4a52070b658720f1b50988334ffa/fubitof.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c08aa1f5225098b441db19f95b648450/digixemomoripadeguno.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bebbb877e---benuvojupoderumener.pdfIn PDF document text
    • http://fittbike.hu/files/file/59418787494.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16073021fe68cc---forufeve.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/69376311731.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/pugubokitowor.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/dilerivunojufifanarono.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c384755b0---28723560978.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/jigisakirazimigaja.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/gixaliwo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e207b22b---49124274718.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vorekikefetemanarefudapa.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/fugakoxujufeguwig.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/wewotomoti.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vufinedaxidux.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/kolage.pdfIn 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_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 11112 bytes
SHA-256: f2781122200f703508c5c681c721e38665d516619b4b8a0d52ae4870dee64a0e
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 18792 bytes
SHA-256: e16d300ab49c471f86c83ee36446dba7af3ee8160e45dc77e17983a3951227c6
font_02_sfnt_off00013ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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