Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caaa2e27edc36db…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 02:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdfdeef9b9c96f72e62e14e79943621c SHA-1: 89e1a79927fc87d5218cf0683737ee45e2beaf42 SHA-256: 1caaa2e27edc36dbfdbde7ca71e0e153aa894c50516b7bc46cd50b7a7be5be23
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9d043de11be45ca323bd57ddc8f8a80c/tufafosipolik.pdf
    • http://alhouti.com/userfiles/file/nogakepovuxemakegelu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e96528fc7---sukupapidedovi.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b3b22ae0955a425cd7f6e9ce7e65d2d7/lanagejuj.pdf
    • http://pressvaluation.net/userfiles/file/xatanozebe.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jsjvvpr98or96khb6llun4ou06/17345460397.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7bn1e0gktccvar3k6v6m9hmv12/26733881147.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfcdb02f4---64880923113.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/dewebuwolebovurovaruk.pdf
    • http://foto-preiss.at/upload_files/files/xefolidinudipojen.pdf
    • http://cdmvt.cz/sites/default/files/mabif.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/20906783156.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb5e496b44---mimifama.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qt8jq915m6jo5si5eogl164d55/jokedivupusaladimused.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/79416026771.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013d732523---45009437192.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gngn0i69fq08hsqtv4pqfn8sse/40632791542.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f7d4334c3bd2779c2884a4a2b0976e19/laroniteluwijegokosodiz.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/412fa303f17eba1a17ef4af11ed50f32/17496318122.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f4e1b114d---wiruzawumujepanezitonu.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/641a802893394e796e1b1031212a21a3/92930849923.pdf
    • https://ludifrance.fr/userfiles/file/sujeziv.pdf
    • http://bmcnx.com/userfiles/file/pepameb.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dpu5s3kmkpfvgbeve7ieo9p4kp/14545399680.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=allusions+in+the+letter+from+birmingham+jail
    • 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_off0000f9ec.bin
217a5fa190555642a5059e1fb890a328c3c953e4be20a4e2b318fbc24d641c33
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 11012 bytes
font_01_sfnt_off00011351.bin
a237be72e3ed60bac5f7454af9cc758ff8ec56afb4e9308b1f3a114dc76d0f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 17964 bytes
font_02_sfnt_off0001427a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1427A 16792 bytes