Malicious PDF — malware analysis report

Static analysis result for SHA-256 166604e33378ccfd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 21:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1667238a028db5471529fcead20e2b0d SHA-1: d4e8c4fe5eafd4ff43b9ecfd037e1a3f45ac4c34 SHA-256: 166604e33378ccfda2bcee813644b32de7963ec456e43fac00d85ad664fe61eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious content.

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 https://nomylo.ru/uplcv?utm_term=how+to+start+my+mac+in+recovery+mode PDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135434b00db8---perobijavig.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/bigumogokex.pdfIn PDF document text
    • http://bakoca.hu/files/file/jununoguti.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/44778076655.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wadeb.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16149f7cbbe189---44089105287.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/32757065490.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/94761687231.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/337137de773154e63bdf3fcc81ed6c6a/3949523647.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jarowotiwomazi.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/62064344862.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/30347145170.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/kepelugadukajerabuta.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985e231a76---76566452119.pdfIn PDF document text
    • http://aquatherm-graz.at/files/23618600577.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/gotebomisefo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf5104683---nipikili.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/4269826524.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/juruxureroratupovi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8a38a4fee3e4459cd1db454cd3602b07/64328528158.pdfIn PDF document text
    • http://oodow.cn/upload/file/210906021413029750ab4l3krgny1w.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/bavipokadoxabedododevozaw.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/bekixomawerug.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/kaligibabup.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fb8d3cfaf541b6d5004fcc3ff945ad53/61110653124.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_off0000b8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D7 17332 bytes
SHA-256: 194740d96b9662e6cdfd6fd383057147098469c6ccba920aa92d7d8f02d45fab
font_01_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 10740 bytes
SHA-256: 1eaf6efc2d28e40dcbae6d2e28e72f6135989120d5f8df56a6cfe8039a2e1f34

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