Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a9d755c5aa53e1…

MALICIOUS

PDF

143.8 KB Created: 2021-07-29 23:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28ad4f0d1c23d90f4e3ce24defbd6449 SHA-1: 769cae677a8f98fea600029e055705d53a812ffa SHA-256: 64a9d755c5aa53e13b7e5e105599fbdc9092c0271980daa13043b8c7d3187ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution tool. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://garglob.ru/uplcv?utm_term=persuasive+writing+examples+middle+school PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988018d0ac4---43625133833.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085332690955---lusazanawiraxefeput.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c6dfc8dac76c6f6025108045510851a6/80682135064.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/bafisovavuwekoxazevalogus.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801c6f3ab2---33683909176.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/05913bf9f712f6c6cc1f6b6bb3044372/61471335943.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/79707003787.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/rojegetojeni.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jumafirewilovajisagazot.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f75d18bf88bcf0d6114de49ad4cf17a2/3662052830.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/72479256620.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/nofatedofenudasuj.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1d54ed6bd540d8c36627640fe549d8dd/sufopegos.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/tukapira.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074709551911---92522890691.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338b43982d---86196846654.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/60837004326.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/21874522153.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9d8999a82151d4ad2b5d055daf52f30/89168461136.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/gujiluveto.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16240024406794.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/1956830586.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_off0001cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E76A 11316 bytes
SHA-256: 295838ecda4cf8b81c2f79dcb9b47688d1208a5c26258800f7bd15dfd7d9ee9e
font_02_sfnt_off000201b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201B0 17964 bytes
SHA-256: 6fc483e6afb04ff35d3e2f48d57cd248aaca4489efae78251121740bbefd6d8b

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