Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd70b5fe68c5d422…

MALICIOUS

PDF

95.4 KB Created: 2021-06-09 01:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87e46e1872b5019f44638cf339289352 SHA-1: 20d4cf4b45fb3a95b9b245fb913f71910cfdea0f SHA-256: cd70b5fe68c5d4222e374886e473a0e46e379700d84d90b02e4ad8d215ba3b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9381

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=tense+formula+chart+pdf PDF link annotation
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/2498a5af10351ccda1f80d907a9df189/77070118311.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/4258050926.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c454b2321---gezovov.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3368d9747---dotuporumarazomepa.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607773477b6ef---sogetelataruvobe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607097cd4bcf6---79809971909.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/26ae2f6703c8f830af792c6dba2079e2/minikujokavetizuwejele.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/devemubazi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160940fc0a372b---gavadikijenowaf.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09efe1cdf---32319449584.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/sonowogipumivelem.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kdubtn9bgg42momghvjs7qv78k/bamadatozitegorilowonin.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/17483616968.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b3ac5e51cd4e5b2f715a36a63e7b6d12/83639154329.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088b35579834---51608043539.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8151f1072b6cf20ebc5d04da12f5a855/12600751790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 5180 bytes
SHA-256: 230f12aa34da4343929595e7872f5a8429118ccc2c5b9d49748494b9980eed8f
font_01_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10268 bytes
SHA-256: 2bc3441cecee67e7b16a3f4de23d0ef4ad616ce305cb8888323100108b28f1f2
font_02_sfnt_off000148cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_03_sfnt_off000156cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CF 12328 bytes
SHA-256: 1fcee0534bda848a39fce515b715082b5986a41155215aa63a0a8135da12f61a

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