Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e5b81868e4fc5f…

MALICIOUS

PDF

82.1 KB Created: 2021-07-03 20:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ea36956a153b6f485239aab260fda2e0 SHA-1: 14bb6957cff6f5228d3eb61042dc9d1199ddd076 SHA-256: 13e5b81868e4fc5f71269e6c65340a8354a33c5feeeece25d2772852d982acdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9933

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
  • 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://jambumanis.com/contents//files/taxafufixuwibedat.pdf In PDF document text
    • https://spacio.hk/attachment/file/nipovuvozepuwagagesel.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/rolomadunivupedogujuve.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210620175920.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f36c2966f74b7cb588edf5c3ff212c2e/maxapokuduwo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/27811497503.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/rotobosodimifusaranuw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c16201b24---62456017860.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0690d1b93---migutuvikometo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1cd6908b222322b261b391cc9929989c/mowovovazobigo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b5a48k6gppbe7sbq8adu3tqq5h/ruxuremaxabelol.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0c4ae604bacb4d4c9f1e6854bbc16d60/rudabewavose.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e79766e04466fc399188e209190e0f12/15603268141.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/57759174197.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ba2eb905973cc6995945424e666fd92e/xagoxuw.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8hjq9psdp49fpqktstrg0876ma/tupeligozubozejiki.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/12186277851.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f3f9893ba4dccaf93b922bd3c4b39e8e/47995876725.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9evr2mr0cp4g082sdspkvo26qg/42020611000.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d07db0bd---75546631170.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/eiotb7tue2nc5en0lic6g6ea2m/60750604108.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085416bb33d5---3126468953.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ddbe156ff---20103467442.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/34337ea9ecd249ab2a69ac56b1e62ce7/18629989927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=compare+and+contrast+the+role+due+process+and+crime+control+modelsPDF link annotation
    • 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_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16368 bytes
SHA-256: c14ae9a8d8eab9d355b207aaa366a4dde3b1abc7f8a369a136a3575d39d7b418
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 10912 bytes
SHA-256: 18f1ea8255baba67625b92ef3d26106eaef774328b4763144276db1ec2b79b8b
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 2600 bytes
SHA-256: bd516add5ed66fb1cef3e8833f8dc95a55c3a646de538e30e95769ae85466dc9

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