Malicious PDF — malware analysis report

Static analysis result for SHA-256 51eeaf02236cf827…

MALICIOUS

PDF

90.1 KB Created: 2021-08-19 08:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8529a43eb9feaefe15976d821c7eac8 SHA-1: de17873c02f13d060e86f34213e318fc8711b2f4 SHA-256: 51eeaf02236cf827d2bdb97fc496795582d941e04493e1b12f2fb02e6f417cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927d5c35163---pibumefaguxajawasibizi.pdf In PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/vusegowajeguwiposufe.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efda0d152f---80684332769.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/29697885926.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/13659942295.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dozevipupedugam.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/fuzemibomuw.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/jividi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bf2aed763fae68414c47423b8c3bc9ad/12969295617.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/alunpdnca51u2mfhg7r6mi5hv1/35213735997.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/91884543935.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/worumiw.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/walove.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/vemofakewitutimufuxakome.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d17bb3aac---rujulafemimoxonowanevo.pdfIn PDF document text
    • http://findplusltd.com/file/40218527094.pdfIn PDF document text
    • https://petikdaun.com/contents//files/52622497429.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a300a7e4db5---nixijipevumu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/66c276514439414458f55b67df595f9e/kokojukiwoxajexisero.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/13449113209.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16238514050972.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/wupujafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+silence+cuisinart+coffee+makerPDF 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_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10768 bytes
SHA-256: 8fdc488d8a81709f577f3eaab1397d5d6eabdf27121dc78e215c497ad0c329e5
font_01_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 17576 bytes
SHA-256: 7819a183149de327864f99836478cee9f7ed85ec67f529d4b072204cdbea12c4
font_02_sfnt_off00014220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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