Malicious PDF — malware analysis report

Static analysis result for SHA-256 651740844ebf371e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 23:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 940c3e896fac0e2461fb2c5f09263851 SHA-1: bff95a6474f9cc5b8bd601dba119a598df508510 SHA-256: 651740844ebf371eef159b72d9717353af45ef5a1449f4f7e27bbebd41ffb5ff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm detections strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=android+stock+web+browser PDF link annotation
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/39680532844.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/59558096358.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/lojubimeze.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/83769801706.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/18275775464.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b28391430---10033468179.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/ruredaziv.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/nozegudetosadewexax.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf03b22c0---81497956632.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/sulufelix.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d9a5e285f7f1c697c3dbbc900c952026/40563841898.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zafibezabub.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/jokosufopetev.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161352116a4e22---todejudefazozesevug.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133125742deb---83925686012.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ec4ba1153ac6b1f1645786697131f062/25650038885.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/39843904789.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/724620189.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02300538f---didonesidudelaxuwanurag.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/68813757519.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/80889995366.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/1964138622.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/79441299359.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/83888293611.pdfIn PDF document text
    • http://maxbrio.kr/files/files/64780151982.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 17020 bytes
SHA-256: 3b8a67ec6c0f9493f0ffb47e0fd759656d0d091834f430ca42281b62d3afd626
font_02_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10452 bytes
SHA-256: 3b782986ffe5b50dc3225658aad04a71edf570930a1440c055b29b7403eb0ccb

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