Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc75a6b25f8fdf8…

MALICIOUS

PDF

91.8 KB Created: 2021-09-19 02:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8d774ea84e34daacf5e5829571b6bfc SHA-1: 763b8711f7abaa7d29251b63104dedc7a57353d9 SHA-256: 7fc75a6b25f8fdf8f9cb7195ed915f2ec63bd8aea3da862058e6706095607ea8
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://koncnc.com/genelresimler/file/2804097174.pdf In PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xepuro.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6135c192f1ef6.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/190008031467.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kojuvenoxiguwi.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/kadapiwoliluliwefuve.pdfIn PDF document text
    • http://effektfilm.de/files/file/41661695914.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/18213861301.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/vekitukivutifepowoxirib.pdfIn PDF document text
    • http://intertravel.hu/_user/file/pinamiridefilokaguxesojom.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/buzezubimazamof.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d0bb4714---sixisuzuluruziwidaruwi.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/99221523229.pdfIn PDF document text
    • http://asfalon.com/__files/file/46142871960.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/xesumigetixigozexesanuf.pdfIn PDF document text
    • https://domilot.com/uploader/files/tagivonunapiwajixal.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/nigelegosuvivufumatanu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/66368160903.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137938aa9c2b---wezotuwolupirete.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614138c7bf3fe---46817316088.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/20946986242.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vajimolokulu.pdfIn PDF document text
    • https://loyd.rs/images/file/kufuwufivajefusuzotusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=purana+wala+beauty+plusPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10472 bytes
SHA-256: eab81bdf635e5541f480c13554914a6914f354ebe2aa9bed65c9625136f54337
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 25068 bytes
SHA-256: 57372b14cc3fa68777509f42260c46da1f3ff0d64888715c17aa5bf693d4f7ad
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16252 bytes
SHA-256: 0295fde54f33375e71b312635bb5aa3d847439f716fa23b213b1a2a317692eea
font_03_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_04_sfnt_off00014824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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