Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c9ce650c953358…

MALICIOUS

PDF

87.7 KB Created: 2021-07-21 13:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 804b390cd2800a85d5c44a5b1a93ad3f SHA-1: f23dc4cc7d903f15af8f65e74a0cd5886bd07aef SHA-256: 43c9ce650c953358f45a565663c959934ce4c5fd7e475d907530393810269a9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pui-vital.ro/msg_media/file/redatu.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f06f1df9d---30499521249.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/84496075317.pdfIn PDF document text
    • http://namngonviet.com/user-/files/nojupuxudirisi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d599966d4f7ca449679376307005427/61202507067.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/195e47703cf3ef0775edbebd3880481d/58831521632.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/falelaramifuji.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/tiguwibazefosese.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096df4b0068f---sidusuwisozolululojizotaf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c596e9e2738---guxonowolimas.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a04bf559b8aab661e286d520953d8a6f/waril.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wenafaje.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/92967688194.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4af96cbaf43f4b3eb4ddf711cb5ec6da/46461952090.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/27528e0ded36d77cdd405c170145a094/tosixojimelozuroparotom.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecb4bffbf---bilejupet.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/57373728762.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pavezujifora.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2dbd55a7---31303258883.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/damukekadigikemowejike.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uk2meh6amphi7qfcqa8v1qf4j8/bamefip.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/i29bul0ruostn602uc9673m1sk/nakepezik.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f8d50c9e---69356769722.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/78251472652.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/93571920998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=plot+of+sinigang+by+mariePDF link annotation
    • 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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 17780 bytes
SHA-256: c75617ca1077eec4daaa45263c9f9f24f8ffa7016a112c9de9eecf5c79d89fec
font_01_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10812 bytes
SHA-256: 44ba3f3fd9d1a71144d63dd2ac3c4d879053c649b7aa5b942d43ce2fdc882d49
font_02_sfnt_off000137bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1