Malicious PDF — malware analysis report

Static analysis result for SHA-256 526898f525e51d09…

MALICIOUS

PDF

86.4 KB Created: 2021-08-18 12:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 22730c0ac3630052d90f855f949e1f0c SHA-1: acd011640a81d883051f2a8d1d527464b64b34e5 SHA-256: 526898f525e51d097343caf4030937e8df77a280ef5d2df7606b3e4b4faa058c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's designed to redirect users to potentially harmful content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=how+long+do+unpaid+credit+cards+stay+on+credit+report PDF link annotation
    • https://divinenine.net/userfiles/file/vobaseziwuzelapibo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/30176689327.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ee35b5324b2960ba146505ad32bed440/salimavuwowexirabowat.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/30200842246.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tigan.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b747a2b67c5---67638068592.pdfIn PDF document text
    • http://imbirimbir.ru/files/satumosuverupulus.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/nupus.pdfIn PDF document text
    • https://miet.hu/kepek/63418983551.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94844004556.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5so1eq52nm7d028i4dsm2pcm40/nenumolalu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/bopija.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/72ae18b9cc06250a3093345c6e960eff/bexebemovizumu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/pogajokugozolulajifudi.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/40270197037.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/9373949942.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/sawot.pdfIn PDF document text
    • http://beiks.info/public/file/zijiminobap.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160dcadf83861c---89756394447.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef1b391d2---kawanoxinasubedubujilazar.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/buwebomiril.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/pujozore.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9ea76a55d74af545769726b73a1630d9/51249178423.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782bb799de5---gotefegefinafojo.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_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 17056 bytes
SHA-256: b9dc47a660b079eed384cb7e60a40b64d7b1684e0b78f63078f5a7e4d69a7c63
font_01_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 10980 bytes
SHA-256: f23ef84b3cf2dccb545761f6e8e478823c09e383ec237d737d9c508dae063ed0
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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