Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc0dfb2483c481d…

MALICIOUS

PDF

115.4 KB Created: 2021-07-07 18:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9e1d691cc6e74228a40d42d55ecb42 SHA-1: b6bc2b9fc916b10dd846922acc13598158cc7863 SHA-256: cdc0dfb2483c481d0a60ca6c8da5d3acb438c362262459dfc52f6d01aa1057fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=linux+reference+guide
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/eeca99ef80d7feedadb9886482a251f9/23955701170.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8e01c3cf55cb62220ad1e1d31f5771b8/zafasaj.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/dd3ad0bdecf0fa882da1d66203094c2d/21415447812.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3775b97c4c15f235c6ffb077d9bde561/gozemebipaja.pdf
    • http://allaboutdowney.com/userimages/69742391520.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210630105955.pdf
    • http://hutergroup.de/userfiles/file/23769896285.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3fkneilhs18lqmg1qaqn7ih5i7/6545659387.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a46bfe480bc---38859681341.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/cos52jbjhbb7r29b4s6vl4vj2n/77235771085.pdf
    • http://lhsclassof68.com/clients/73441/File/vopumi.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8038ea26c6a2d8a3cc6ff260b77a2417/45655571158.pdf
    • http://herve-coiffure.ci/files/2274131626.pdf
    • http://traiteur-ribot.fr/userfiles/file/64645045410.pdf
    • http://chapelguild.com/images/usr/rujivuvusuxikuruwiden.pdf
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/xukaz.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/sojanoniniba.pdf
    • https://jamuiboe.com/webroot/upload_media/wisipipabanesutisometa.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160766e8eb60fa---50168472854.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ca8e7d1de6d227aa3d66ba3208562955/fobapigibobo.pdf
    • http://vodnik48.ru/content/file/49010901708.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/nulofamukapotos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ff2.bin
1d99ce1691116050c594c22d1c3a3f9d699fdea00d5ec8651c80688aac62b78d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF2 18512 bytes
font_01_sfnt_off0001911c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1911C 16792 bytes
font_02_sfnt_off0001a933.bin
105690e2b9ed933fa92ef5b2270afa07f18d62098206d63bd6d7d62a27f363b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A933 10216 bytes