Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb751cc12bb2224…

MALICIOUS

PDF

89.1 KB Created: 2021-08-15 04:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac4d0757f2b02a0c40738b5404a0d2e8 SHA-1: 6e5f4faaa27ade0d6e06663de698006676b80c72 SHA-256: efb751cc12bb2224a773c8051ec1002ffe44ddeafb51d27cae08a492afb657fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=smackdown+vs+raw+ppsspp+iso+file+download PDF link annotation
    • http://travellightnepal.com/userfiles/file/66150998883.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0af9d3fa---22660367048.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3798a8c2---sonupixefule.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/fejipegarutulixe.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/138056636609ca3fe30d62.pdfIn PDF document text
    • http://allasclub.com/campannas/file/77264317642.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/54025100382.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6f27713e---sabaso.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/05181eb941c47648d10446ee066f756e/kukixubasonobiwet.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/c02obl13s931bu5o8irb1d5es8/64189272824.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942935589c0---fexidumizunepe.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/duruwogemamotagoxanekevok.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609840948c56b---towasuleratixigubakeker.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5d3453801a40b8c741492b50f684b371/bifudalavumef.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/46565751684.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02d651b83b---bejawuxaxivo.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/5293404991.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/65930543603.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/mepitodifaw.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fofafibafemuvupix.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/17833249428.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59713819420.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d4396fb7---87237811135.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610480e209c53---32060930087.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/goteze.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_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 11000 bytes
SHA-256: dc6cae5058d8594d4a4632fdcd1ffadb7d58f7231963a2d3ba95731ff9a8eeb7
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 17688 bytes
SHA-256: 9c8034431560298f5e4522b684e408c1d79ea6da61b0a2b1cc97544290162f78

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