Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dc86cf27c5c328…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 10:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56f20a078fcc6bdccd48a667e60fbf5c SHA-1: 3259ad4a303483237795fb7bcbf125c952b2a9d0 SHA-256: 77dc86cf27c5c328fdd8c126e253886c8787529f40d291f1ce05deb82f5c360b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the ultimate destination and potentially deliver further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6941

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1ee92bc49ac9f1c2c3ae8ee184e20b00/73050415007.pdf In PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/52704306492.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ca0aca12---37145156099.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86a9863752.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/10491944639.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a2a527d3---tizosit.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5d8c649993feeca71bafdb04dec89753/51167629480.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6bea77329dbda6375991f566eba56bd7/zatefelad.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878fa6d21---bapumevisedimegojuxonet.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/defeporuzoxedokozi.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/jofedotewogojanupowoduk.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bajurizewogepuxifapoduba.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/48133186260.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/80573971489.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3d64bb799---gitukaferamufaxe.pdfIn PDF document text
    • https://medtek.vn/storage/file/tevogisorakifakemopam.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/55820648081.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/89126036022.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zititisesevimirivufar.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b36735f3618e74f9ad417ea651e2c0b0/sejewomomoga.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/64801018484.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/17846253772.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/63643402041.pdfIn PDF document text
    • https://ivanamihic.com//files/mezorusuxidolam.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87198dbd8---todepewubujuvirusijipuzes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=craft+graphql+apis+in+elixir+with+absinthe+pdfPDF link annotation
    • 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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 11164 bytes
SHA-256: 9542fc41fe0ff260d24d32e3e9df3c6feee0a0feb63d4a1c8d073276f8ca7807
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 19844 bytes
SHA-256: b4541d471ef6c203a807969b5fab861dfe043056d60543ec4ad5dbf55eb2133a
font_02_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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