Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fc8bc060d6a319…

MALICIOUS

PDF

82.5 KB Created: 2021-08-30 06:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f673dbf658e01406534bee60db27aef2 SHA-1: 597e777bd6fc154e1415986783089eab9038548d SHA-256: c2fc8bc060d6a3198fe3a41580cb6666c0da75ed5b4a95d296970a49c594bbbe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8c38075359787b1c4e70e3fa09291757/93659124193.pdf In PDF document text
    • http://messtores.ca/fck_user_files/file/50385328047.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mgfk8qend2uh83307t1f6ludha/xibobagevumutoga.pdfIn PDF document text
    • https://btegypt.com/file/lumunugepixote.pdfIn PDF document text
    • http://pronobile.de/catalog/file/28553096538.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zizajisejugozagure.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/405631e2f256bc88553bd0612b97d491/80079845758.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//niwerotabeverex.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3120a545---mupokupu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/nuwiteneraxiwoku.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b633be3b5ea---16826281130.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b691ee441---tutomupipakajozetu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fubukimuligoguwisifer.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e9c01572a0a4e8d9134fae2c8e4e4c92/28829753007.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zogadurutapilajewurazo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416a376e40---9633962499.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/tekokaxu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/gidudikafizuzebose.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608361ffdd1d1---66341647760.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/puwedomufudenibebal.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c571a8c67e---figiboxusewez.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/7562292671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+sage+handbook+of+family+businessPDF 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 18808 bytes
SHA-256: 9b4d1c7127960d2d934cdca9e42844a304fb37d8cf5d18729817d0d0f27c0d50
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 11012 bytes
SHA-256: 71a9e80f767a878c9830f53c59550485d5d5b3f924242fa4ede87a67bc5af0fc
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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