Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ada2649c002b151…

MALICIOUS

PDF

86.9 KB Created: 2021-07-30 22:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1981da28b44412b733616e2fbb22c9c SHA-1: 0dd183fad20aeb71f9dfc69409f7b969ff2991c1 SHA-256: 9ada2649c002b1514de83aa3d85e95e1e64e06d4024ebce69a8c8220d104a9de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a high number of links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content or phishing pages. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable antivirus, a common tactic in phishing and malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4f6ef013f49a8aa0cdfa76ffe181f1/zazunakogofore.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/20e550166be66bfbc20bc64087e9ef52/lakituzowus.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f9b9179ac3c80873c42c38246364ba3f/besijuzupujofi.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/68163409516.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109a6d3a7b---73879893901.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/dosapipesupoferonevix.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3914a5337---wutuxadibikuv.pdfIn PDF document text
    • https://subarini.ro/mm/file/90369559635.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d145a52ff6ad879557c6386f59078bc5/fufufovijiwifukege.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e29ba14be9de37be31dcf87ac20ac56b/89914168149.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1e1757fa692546cc029a9d98d5dfef17/gediwejenijexobegoxozujef.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/5363256977.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vebuk.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gfcuasivknsj46lpemaud8pv3u/75776278042.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gexiwepuj.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/libofir.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/notarudi.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080308ac2f1c---jemefuxa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57362b3a1d---venutubamaz.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/xanuralevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=4ukey+for+android+register+codePDF 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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 17712 bytes
SHA-256: 8c1800388ed48fc86eca5d50a35cb308532d72a6644d5c12540028207044e29b
font_01_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 10892 bytes
SHA-256: 0776f3b7fdcd16e6072665c2bb2e51e1206b54d7ac0e50e1ef936ae5bd96ab6a

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