Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0a28eeabbc7a75…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 10:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53887769f069e96c5c696208bf1024db SHA-1: 963f0d629b49ec39800594b907d0faf3ec6ea475 SHA-256: 3e0a28eeabbc7a75b50259ee71bf3f35822b2534418f26487a3f1ef6315d7efa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wjvanderheidedienstverlening.nl/uploads/file/45759124810.pdf In PDF document text
    • http://ombs.ru/uploads/files/jaboxokitudipegus.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202195542402609.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/nitabe.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/54144588496.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/88162960975.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/2349627336.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/64653480042.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631186459894456568.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/jawinolo.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zuzubijipufekilibufixa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb9b71db6---44753128019.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/derulituke.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/28875269283.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/nawagotobojudepafupuvik.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/22413607337.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/83544526422.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b145c1b9ef8868aa4e8814d514508bbe/dejuti.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/fipevalijuxaz.pdfIn PDF document text
    • http://okvin.org/userfiles/file/3815020204.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/dafaviwiwitimixutejo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d4551c733061dc24cb1c181e3ef4f5bd/bizejowukipetagarus.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nojimibaneginimonajegib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fighting+tiger+hack+mod+apkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/54591104520.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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 22324 bytes
SHA-256: 31e709b9b5a96425fb547141afd2f099ce19cf79a40b9a2e2d1775b164045e52
font_01_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10816 bytes
SHA-256: 39ff5301e08f5900c3fb10f4f5ba26c8392a4f1dff1a97a1554c9d79f46ca321
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1