Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c565cbff764a01c…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 15:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c52b4816e6cbcc555760758092eee621 SHA-1: abe67f447d5160a2b34b5bfc701fb4d4d297047f SHA-256: 5c565cbff764a01c1cf9f9b1382ccc59af0068dab49f52513fd9d7f9eaa265fc
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The presence of numerous unknown URLs suggests a redirection chain designed to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kursadowicz.pl/Upload/file/vojatuxasotutamutigux.pdf In PDF document text
    • https://luatsubienhoa.com/upload/ck/files/galibijadanip.pdfIn PDF document text
    • http://carszana.com/image/upload/File/nuvof.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/67441208163.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/tumelagorixone.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/82426505937.pdfIn PDF document text
    • http://zerosquareonline.com/file/79453956312.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/76d31e6c6fc21dcd2754356abfda53da/72376355735.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/41128854840.pdfIn PDF document text
    • https://zzhqhi.com/d/files/nedapenenum.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913114527592639.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/17140096280.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/84019734586.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xuwigaser.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/regoxurajowivabug.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/49697922305.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/3142072102.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/jexefuj.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/89195782940.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ed9373f---10425376509.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16158b29d32d71---vibaze.pdfIn PDF document text
    • http://besteva.com/upload/files/mofari.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/xutukegavugib.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/tekokurarurow.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/foxosuremepata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=simple+morning+routinePDF 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_off0000b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 17312 bytes
SHA-256: 893848abf9414043f9a6763081780c585090e2a82d0db143b6a8f6a90b07d388
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 10440 bytes
SHA-256: a27f9a2b860c8660652a0468108374738a69fbaf71555b34817b8f833b314f66