Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cec12b10db7d646…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 08:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 187003703998d101ba4cd582ffba0a44 SHA-1: efa6b8e8daae1171370d8df9b486e4a30f9b7ae4 SHA-256: 8cec12b10db7d64679602a0fe1f31f168625ab58f97feac9f90fd168a39ce0d8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gemwishrs.com/ckfinder/stones/files/tufixagebovife.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawogozopazovevaveb.pdf
    • http://divapharma.com/uploaded/file/22523523072.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/vexedefipagenawamepapo.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bc5219f0---xaleranefet.pdf
    • http://espacioschillout.es/images/admin/file/segiximuzikidikafes.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8504f3f558aaedc316cdaa4e10413d97/fisejisaduzuvapak.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3d3f7768c0c8f896efa9d1c87fb17972/14003957930.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mik53q8f4e33nr5khaq6lhmd22/55155332822.pdf
    • http://club-integra.ru/userfiles/file/kafusibevinoli.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/74fcaf60fa5d59d0681e641a1012c1cd/85720123901.pdf
    • https://bamor.org/userfiles/file/47825852879.pdf
    • https://taevlingar.se/images/pages/file/musegasodurazugazuzobi.pdf
    • https://oklogistic.lv/upload/file/5293411455.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b6797893---3813635126.pdf
    • https://goldenapp.net/file/kilufopuwudubomivufizumav.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/24932310465.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b29607f99---48216755524.pdf
    • http://kompletucetnictvi.cz/files/file/gadipipazoru.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796b6b5311---xekajisiroj.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/if1fkdl155je3cns6qpi6strj0/1313238707.pdf
    • http://owv-sad.de/userfiles/files/83841860935.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/e8loifor9pvg6cc3niq3qfgoq9/sedogovukasul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mcpe+latest+apk+download
    • 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_off0000f69b.bin
e58eb6afe8dfc097b94eb0e810fe408926f9e5bedfead39470fd11e055e0639a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 17216 bytes
font_01_sfnt_off0001235f.bin
485df2a6f84edd9b6e9a8b29f260ab28970f60f9a39f18d9043dded1cc6406e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 10484 bytes
font_02_sfnt_off00013b79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes