Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28a7c98df6c7be8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79460f4fd474c90c393bf1e51b1268c0 SHA-1: f8125a7353aabb24636a5dffcc5744e655eeda46 SHA-256: b28a7c98df6c7be8827e4735e93b4f4756a9c2bbb79cb2a7043b7ff039e2b0a4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure and link farm heuristics further support its role as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=live+tracker+apk+online PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f89394af7---jafezum.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/53715408345.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntfbnlf91m313meej6vqaj02r5/namagasujupebibuwon.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/48270730582.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/89994158570.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/s001lp4hickec1c758u0nb9ol3/66819512995.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/88680433230.pdfIn PDF document text
    • https://artenika.pl/fck/file/vofegixolepozazobo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/84592946688.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/togeberawoliz.pdfIn PDF document text
    • http://only-svet.ru/upload/files/wamifif.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/41210407627.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/88197952864.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/76293468451.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/zarapoxidotinenu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/c9h052sqb8fbu3dv3ahp13h9v8/molamesanuzaxudi.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/7943743834.pdfIn PDF document text
    • http://freeski.hu/freeski/file/70652187347.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143378a58520---fukaxezawofo.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/libonekajilewekedeno.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/33298393156777d12ef1d0847ce9690b/zijexazagonika.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/71138573884.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/junutozexeganimex.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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 18016 bytes
SHA-256: dda8d4bfe8820412d7e66682ad9b068739b13b2576e7cb25ba5d7d028fc891de
font_02_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 10312 bytes
SHA-256: dd4a4135706ef434a4f40cd65e9e6e2e6ee08e44d3061910aefe4c0f2a4e5d36

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