Malicious PDF — malware analysis report

Static analysis result for SHA-256 804bf0eac7f89a0a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 21:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0e3989d8c56ccf5f4030fcfda268b95 SHA-1: 35ee1fb89448eb0c6113367188d5d714973681e8 SHA-256: 804bf0eac7f89a0ac70d351ef264aeadfdb9e9258cabb90c1c7a009047c0e498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=pokemon+soul+silver+emulator+cheats PDF link annotation
    • http://cropscipublisher.com/files/upfiles/file/18077523289.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/3133859205.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/dimamevapa.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/63442726037.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/piramesaxagaver.pdfIn PDF document text
    • https://gdaniec.com/upload/files/25250097779.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/74901323944.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s6ttk9un1df34r9qq4nt3m0dku/9317102459.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/95650460619.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e229a11068---figutigajogetodilajekek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1be72713---32705157214.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/79271329707.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/98250408933.pdfIn PDF document text
    • http://emannsltd.com/userfiles/tejuxebivale.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/23137221945.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/gamanenot.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/rejakikepitik.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7tb5n7jdrn8ulc7pdkcck5ohb6/bugasi.pdfIn PDF document text
    • http://nemalipics.com/milusixotevusefogofobane.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161310f14182d3---lamakipipakuzerolon.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/3730613040.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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 18368 bytes
SHA-256: 658ecbe822c554cc6f73943087ded3c230b4f2c8d270e3ae064f70aaadc2034b
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 10756 bytes
SHA-256: 84c5e35d7a0e0f5f2cf941b2e08de0e0035f321cf440cedb61fcab5894fb0558
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1