Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba31956f39159f6a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 14:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4fb2724e22e8d2afa4991be332f0fd0 SHA-1: 16ff7f44418a7a59079a64686b68929e2f1d1f8b SHA-256: ba31956f39159f6a5a0262111921a193bd044311f722072f0c5ed55d92c4406a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6220

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 1

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

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