Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b726266c6a343d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-15 15:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7700ebf4b2f11ed9b9dc1ce9805b05f SHA-1: 65239b1abc044f4a5d71706938b859b203bdc092 SHA-256: 50b726266c6a343d6464c96be83cf23b679393ac2323f84077c5cf2dd997275e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mobovelipeso.pdf In PDF document text
    • http://nataliashishkina.com/userfiles/file/jebefezaxumadexebazimepif.pdfIn PDF document text
    • https://sanagustin.cl/files/19694381130.pdfIn PDF document text
    • https://iwistw.com/upload/files/85299701600.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d04fc9a01d3d79b54a8cfedcc5633707/92203000628.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132680fb917d---wafurerafataw.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/xakusowurim.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/kabuwakosavi.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/notuvipanikiseve.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/12402166140.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/21069584589.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/rilexozadisezudila.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/miguj.pdfIn PDF document text
    • http://panteres.com/files/files/20493076758.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16133a70812062---66672462412.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/78771576197.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/wuguvazexid.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/97872722545.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4d62950785c8f71005647142b4c3ba41/43967784737.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/44486625711.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vewemijukodajaxizixedeluk.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/51248008495.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/18293440206.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17616532761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=encyclopedia+of+chess+openings+volume+a+pdf+free+downloadPDF 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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 20052 bytes
SHA-256: 069abc077ffb62a0ed9c55d3f4032c9b8d3b067d8846378659faae3f8546f74a
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 11320 bytes
SHA-256: ea37b1a7e525d5ebcd7621ff65cb81a5a9a3cf0a96bde1a2f17f17e85861b891