Malicious PDF — malware analysis report

Static analysis result for SHA-256 a894bd28f98d3d17…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 01:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2ded0f3fd5d0a5492f303301082a87d SHA-1: ee8b539ff3f179e9e50aebdc7297f3382b7b1860 SHA-256: a894bd28f98d3d173ca3bf369504c861d807d692a372dc8d05ad4352cfb67037
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://rafaelokazakov.com/file/musulemiburefobut.pdf In PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/95412803967.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/3747741012.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f07737298e510b76c05e36e10e76d8c/tibuje.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/97581502111.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/sizuwes.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/72626503865.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/7278804907.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161478d8218b75---gevozujumovisivapuz.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/54666429785.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/junafotete.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/47816013365.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/64429933405.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/nirifutapufef.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/61006519261.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161528a38d6161---42176456385.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kifuxe.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/29793856175.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/05ae175f5140df9b8ae84b0893597c84/74972656260.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/31371390715.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/17171012455.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/jumalesogirejujitoposikar.pdfIn PDF document text
    • http://sun-eko.eu/files/file/9947782337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cara+nak+edit+videoPDF 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_off0000ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 10216 bytes
SHA-256: 2a412f74088807076f9426e2102cc2d882f34dca0a826f5693ecf28f3beb4181
font_01_sfnt_off0000c575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC575 15224 bytes
SHA-256: 6f08d2b2290842fee9b436994c74b21aa7f2cd5f3d17b5a2754752287ba2dfa9
font_02_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1