Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae26d8a7d5964da…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 15:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78f08d8184976761d2f2a2d2e35579bc SHA-1: d14a4ff94f8dfeb11c23572001b55c8898c3d719 SHA-256: aae26d8a7d5964dae7eb5d095255b9ab40e0785de395d8fcd81d8820fa04149e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/tofafube.pdf In PDF document text
    • http://greece-ex.com/images/blog//file/36535231842.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b76eb93fda4---80897744342.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/k0h71pup2quv23156e63fgbenl/runidigonakevajodofo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/96926470387.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t1qq0dnq6e7heoqhpqrrg38bhr/wikikisiwul.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/lufosokodopekogij.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7ac041d43c747c04dbc29da478a58b66/tapokupofewonofatu.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/93475110803.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ec785ab---lujasowamujumagajiz.pdfIn PDF document text
    • https://medtek.vn/storage/file/74744050973.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/91459298757.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e1d056c8---60742618916.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5669b097---30796050855.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3a9e4694ddde989a2e7f947b28b7f012/48960897088.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc00fdccf8---92536226924.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d023ad7583---59292775992.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/xowapavemavubawutafof.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160caa918c7ce1---jewuwogodujuripofunuko.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/55708359193.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5e855ca27ba14ad19f80d597033f6d3e/vizuxofeju.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/dijopokefawoj.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a8e636e48b10f22a92b58e137a6897db/lodiwemufikapo.pdfIn PDF document text
    • http://www.celso.org/download/liribozuzemosapesigon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=speak+english+podcast+com+pdf+006PDF 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_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 11424 bytes
SHA-256: 44988c0c2bf914c21c6ff7c5e3cc5e57507c2878281c94b53ed5276a4b994333
font_01_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 18056 bytes
SHA-256: cd146bd34b1af23d06e60eaca7556004f572d616f3c04259d5dbadeb14060e44
font_02_sfnt_off000145e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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