Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce473efa06ccd4d2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 20:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdabbf3773b14c7c4137750cbbc77b64 SHA-1: 4d29daf4bc859226f17b51d5332085d1a24f451d SHA-256: ce473efa06ccd4d2461bb98e80abcb7a0a79f0cbc7ecb21b2d2724d737651c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://superfasttv.com/uploads/files/20665698351.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/mofabuka.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/80233429084.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pjjofvthkeae1eke10v0n3ib80/fejebewoximakosozajodoti.pdf
    • https://digireg.gr/upload/93192196070.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/61256803856.pdf
    • http://vivatbacchus.hu/files/file/maduxoleredijagidulujav.pdf
    • https://cli-kh.com/uploads/files/202109102144346665.pdf
    • http://linkingpeople.info/userfiles/file/xekopetefigezawutevel.pdf
    • https://pensionradvanice.cz/res/file/xamulijidogibawukas.pdf
    • http://gamjagolla.com/uploads/files/70414441049.pdf
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/ruzit.pdf
    • http://axwelindia.com/uploads/96345616126.pdf
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/labodenurujudasulupe.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dbe71d9f2---lopejifufojefovire.pdf
    • http://www.mostex.sk/files/articles/file/zoruvezunudide.pdf
    • http://thedreams.cz/files/20770283865.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/94077432748.pdf
    • http://polyalpan.hu/_user/file/989798627.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/pukajigamufetiviwax.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/41301826246.pdf
    • http://tsg-edinstvo.ru/userfiles/file/vumukum.pdf
    • https://phu-komplex.pl/pliki/file/73780968072.pdf
    • https://balticstroy.com/uploads/files/zufuvinusanufexez.pdf
    • http://yuh-tarng.com/userfiles/file/fafozikudafemow.pdf
    • http://phelieuviethung.vn/upload/files/ganapigejanuwoduwot.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1d5c21681275b90c29a1890366aa2c30/63315082346.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+talking+angela+hacked+apk
    • 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_off0000b9de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 16792 bytes
font_01_sfnt_off0000d1f0.bin
8f57ca59f3538ae9312d08de4415bf2f23a9f839698bce03c9ef07b9f0ec544d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 14944 bytes
font_02_sfnt_off0000f757.bin
27fb69b72c1f36bf6a9089bb4c6107d7658b6ce6e7f310d2cdc0718da5002801
pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10604 bytes