Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95747e754de7de1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-15 22:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 456cfbe61c16d3acf6be016e576c484a SHA-1: 55e2d77cded599f797218709176ce4109a4c1400 SHA-256: d95747e754de7de1986182f568bbb562623c82bfd3db131bf0faa3098e8c0f2d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. The PDF structure and the presence of many external links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/830bafcb199bb298b39e4a9e8f813f5d/16043722268.pdf
    • https://ruiguoex.com/upfile/files/2021/06/03/kewiminokimazo.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6f7502b374304e71c784cf9aba2db197/kesoloxef.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b274deeb---zasugosusanuvarepa.pdf
    • http://www.lnk-creation.fr/upload/file/kizupateserakibonopixurud.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/41493881192.pdf
    • http://baugeraeteverleih.de/benutzerdateien/14663397632.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160975b9998b76---zugex.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160850f675f1d6---67492831183.pdf
    • http://mnogonomerov.ru/uploads/file/nijuluzunomisukademebe.pdf
    • http://safires.cz/ckfinder/userfiles/files/62958524179.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8aaef0863---30475704223.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/45381132640.pdf
    • http://lumieretvie.com/userfiles/file/53013551293.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798911513d9---zedenev.pdf
    • https://alamansyria.com/userfiles/file/32882939624.pdf
    • http://kaitosushisb.com/uploads/files/18874937519.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abbba33195---jisegu.pdf
    • http://icmasistemas.com/userfiles/files/24277480989.pdf
    • http://adance0112.com/upfile/editor/file/tosileso.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a724fbf95510a7b621fb6c67b9aa9cfc/60671319380.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b529e62a250e7dda11e445f588a8a800/22969329440.pdf
    • http://eot.mn/uploads/userfiles/files/xepofije.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=containers+in+cloud+computing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a9.bin
50821a97ddaa61b9923d2999d14b3a855b9723ce43272600cfee9496bc00ec3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 10988 bytes
font_01_sfnt_off000101f8.bin
ea54fb72535fcd1cc233f0a4c8fe664182a0343f97f1c1a71fc7500e01f37ba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 17768 bytes
font_02_sfnt_off00013028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 16792 bytes