Malicious PDF — malware analysis report

Static analysis result for SHA-256 199b2e8590baa7e1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 04:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e8e23824f1f472604e21a737c82241c SHA-1: 5996f0544ecfedb7e52f154bda8fdbc1dd8143e8 SHA-256: 199b2e8590baa7e1fcab8a8109cfddb3e7a7ea5d4ebbd457edcf6b1fedbc3839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The PDF's structure suggests it functions as a link farm, directing users to potentially malicious content, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://menu2uplus.com/images/file/zolatomasew.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddcdc2328f---26811605698.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/97636583530.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0bf1b811---xojajelinoboze.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/73654379743.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/lojisimiribo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/316a53fd3cee53c8f8f5f040e05f7fcc/60525514506.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/92215774078.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/sarapipejifemilipexe.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/72862371946.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641974bd8a---45526929934.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/tuwevofifiwubi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/93e8216302e5fefd3c80021657eac88e/43291192722.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/fanozisagipozelajijez.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zuvogisixulajerudud.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1088817e52---93668031466.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/47252690564.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/vivelu.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/62582995665.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612176340b892---gavexej.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/28143947118.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cac82219b---nuziterurubamizame.pdfIn PDF document text
    • http://byecook.com/ckupload/files/fifigogi.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/49138559863.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wagezomonidivawodukelin.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/e5c17fb6f827b886596aca7f422270fb/tuxozezopamubevesimep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=matching+heading+questions+ielts+practicePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 17764 bytes
SHA-256: 8fd747ea09327c2519c4895a67b9dd96407652843c901fbc4be12d388716df6d
font_01_sfnt_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 11032 bytes
SHA-256: 5fd4ce84d8cbb85b5084502f29535a1af3410ea874fe9031900d2e2a52244b02

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