Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf526488d529291…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 04:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 285859587559695f22970dbb8d64b169 SHA-1: 210835e95031c217c1f20aa218e94dd87f06fed6 SHA-256: cdf526488d52929104e613df14d0a0d106dbb39bf1042ac3d646c46b8f47c27b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This structure suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/fbg25sl0747dvtni2thm1r3hm9/xapulilixamisafixa.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/90a1877478f5bc1779a4ee6f238f9b51/7026194841.pdf
    • http://brandnewgoods.net/userfiles/file/26373974096.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e236324d---sibimalamiga.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096edf3cd62f---90413192851.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85913939259.pdf
    • http://gdbchurch.com/clients/43262/File/26094142629.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4aor3okn5vhs9qieu8rpuvfg43/86669805027.pdf
    • https://emprenderem.cl/files/1800993361.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8cf1548ef427efdb264e6cde7ad9b71e/21112134978.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098eb7c25ffb---jigawolim.pdf
    • http://szao-spb.ru/images/news/file/33969026797.pdf
    • http://ridendo.cz/files/file/17149050045.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e99930f1d935b7bd6b62cfaca1ed59f/47560487944.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l0j0lshb25r08ug71akbbbnine/dosiz.pdf
    • http://amon-syotengai.com/userfiles/file/72004550538.pdf
    • http://aarogyamedico.com/userfiles/file/46197188275.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae474a8707f---xifurax.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/iq6ouqof6dkcgobk1nsnm5d4as/69570279172.pdf
    • http://rheinmotel.com/userfiles/file/zodivuxumoxesajanefu.pdf
    • http://morgancountyoh.com/userimages/98905652276.pdf
    • http://lovesushiscv.com/uploads/files/44917736056.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c7d25e4f3c812148d432698a8c9d897a/74325162253.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ac4a4c700---migijigemazatuvuki.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/41684170053.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tnbm8teb3cr0lu9mncao37g0s8/jofepakopubuzak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sell+event+tickets+without+fees
    • 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_off0000ee2f.bin
e0f069c3325009608a3313b2a3cfe54a9a3a31216df484985fb99f7c5c3c8836
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 18284 bytes
font_01_sfnt_off00011e0d.bin
789ae4544406bb0fcd344c4a30095681e5119ffc31981ee42fbf35f772088aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 10588 bytes
font_02_sfnt_off0001363a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 16792 bytes