Malicious PDF — malware analysis report

Static analysis result for SHA-256 010df9639b6e48c1…

MALICIOUS

PDF

126.0 KB Created: 2021-06-25 19:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4de473aaedcc59ff91990c3594758445 SHA-1: 07ec8ab6b5b8dac370a0e00d454ffaad158c265e SHA-256: 010df9639b6e48c17061b36d0e9af6ec045ad0e170647d64ebaa7c5e49ba50b8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms hosted on disposable or compromised domains, suggesting a phishing or redirection scheme. The presence of multiple PDF-specific heuristics related to URI and link farm activity further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://huntic.ru/uplcv?utm_term=oxford+history+for+pakistan+book+2+pdf+download PDF link annotation
    • https://imagebuzz.net/ckfinder/userfiles/files/49424932624.pdfIn PDF document text
    • http://fedime.org/imagenes/wobomi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/mimitefenawafiw.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c117d0cc30e---bafugan.pdfIn PDF document text
    • http://rajakedua.com/contents//files/tulunew.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wokaseturonef.pdfIn PDF document text
    • https://anfauglir.com/images/file/1918350737.pdfIn PDF document text
    • https://longhoang.vn/upload/files/68665761134.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2964230d7---82529503403.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607156cb2c90d---9058858237.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/16128513066.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7g9drc8u417q4id5iohnqn21k2/zojixifupi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ac069dfb427c151a17986e038dea433c/xogateduvafas.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/07d4eb84d114101ceab3c2edaa43bced/55026153053.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rj5uhvnajo62vkie5i87ag8gr6/30708283634.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e518e812---633001209.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d464c94812919fa2dad6a43b31682bee/kopipurijan.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c6c5295d5---dadugirezixova.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2d81576896bac2da82196dec854495c9/44495195143.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce75150e4f---welopota.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c01d7b07---gojigozogamosaxurigudokur.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_off00018951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A168 11140 bytes
SHA-256: 49533256034ac3ba8f7acf718aa798604de62274a0de03f0bbd815b0ab2efc94
font_02_sfnt_off0001bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB4B 17732 bytes
SHA-256: d7e2f4f7930947ffe822674b3588e74da721a75db3d8a0f98cdaa923914802e8

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