Malicious PDF — malware analysis report

Static analysis result for SHA-256 c266882012b68a98…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 15:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31b2674b8c2ad6a9306fb9677996949b SHA-1: 59330184ad111f253992161d48f183cf5489c739 SHA-256: c266882012b68a9822abdb430e7ef019ec01d3332e89fe0e0004337857721fc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32cd44798a---3312807053.pdf
    • http://ylplj.com/ckfinder/userfiles/files/16157071407.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e2962ab2---62363229937.pdf
    • http://occahomesearch.com/userfiles/files/putolefidigilovopux.pdf
    • http://polymer-optix.de/userfiles/file/91388975521.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/caa95ca7e2840de5a397baa805aff7f7/2635824859.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/662ceb5649cc970cb5a5754a2f9c445f/36094252204.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a811b369b5e23c48e0c4300ff2be10bc/zamarinelowexavesejuvun.pdf
    • http://jfkanacon.org/data/userfiles/files/12340217593.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4f08f887a5890089a705014e60c4d898/ravari.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/kefetadab.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1c3faf567---dojavakinet.pdf
    • http://micronforgacsolo.hu/UserFiles/file/26511010263.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a10c2dfb95ac4b022d483bbcb0a3914a/fojigixun.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fqdjen286rnj5qnkj53tid0onm/turepusajeb.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d75d9a660f---30125950200.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/sifabapabi.pdf
    • http://0851gay.org/userfiles/202106file/2021062607203570554.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe7a72595---69769101279.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59763341556.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ginirewalafevadirime.pdf
    • https://bhsbeacon.com/FCKeditor/file/45820939452.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f80510b7a---peguzejitur.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/igp8ps8vcujh8a23at041jhl9s/43490931683.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a442ced0e66---54745759264.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/309c3483abb436d9d9c0843517255961/74272701247.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+clean+feeder+on+printer
    • 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_off0000dc35.bin
0c7a4936171ea796a2a58797355ffeaddba61fdd3723574dcdd1c39445982aab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16780 bytes
font_01_sfnt_off0001078f.bin
33f8f13d4eb0a6b519dfd8cf045933a885f6a889ea2e8046a63438d4e50754f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 10524 bytes
font_02_sfnt_off00011f9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 16792 bytes