Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac876317094f753…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 21:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbe3525aecf0f594145a4aaea71bd863 SHA-1: 6e810e4ab9d241bdd6855e3d09c0e582528efda7 SHA-256: 7ac876317094f7531a619d610b6ae6054f752f6f67f7e6b71e594a17ab07b669
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://synerhu.ru/uplcv?utm_term=torque+value+for+bolts+pdf PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a4c39f31---tefavapukabilabulevufima.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3578d32cfdeb798a247f0d06186c2f06/82561842550.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/vitased.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///36501898118.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/biwagagifimazele.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/jedisuzoga.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c523ab022c4---wifiwanifero.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/lodavorej.pdfIn PDF document text
    • http://traviet36.com/upload/files/degunijegas.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/tagepovoxowa.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/gutir.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/xelajedefofofuratevu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/27529140076.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/34479453360b882cb3a99d.pdfIn PDF document text
    • http://balone.net/_upload/file///kukanifijejo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/atr3b5s7pn3g4fc23623ck6gs6/xakemasolumatis.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c782be7f402---renowivizofuwupejododoxe.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c9537593cfb0a7dd171beb1b307073e8/mupetetes.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/18c68bbbbf9635f9c38be6687c85d2ed/69404756507.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/jivivaw.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/s6ikjfm858hbtgck9stdcga6p2/salaremazev.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/sigoxovitojugivubiraru.pdfIn PDF document text
    • https://nadamasristorante.it/file/78905599543.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/xuvite.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/jedam.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/44a76490604889db0b11f0fc9b6658a5/62630448846.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/kanuluko.pdfIn PDF document text
    • 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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 10708 bytes
SHA-256: efa9f24bea294d08a68a9432392e3ea4570ceebbaf3d63307ce58f5d69e91f2b
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 16816 bytes
SHA-256: 25036ffb0242cfaeb9127e5e735232ba28d9b824998017a84643b5cc274a4cb8

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