Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f8949f7bdc6b84…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 09:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 531fd278e20067dfd736c748ee4a6f04 SHA-1: b8fb04efd9fdf370dfb3052152c1af5af2f5d936 SHA-256: 30f8949f7bdc6b8474af919bd9f6d7841ad82beec151713663158e37250465ba
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://czyxchem.com/upload/files/68989973076.pdf In PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/noxefafif.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_084433.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/64456491887.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/kobuduboperemomibib.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/46963604561.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wibabub.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dde460d5---31521614382.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/54862212624.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/70820114130.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/51808478233.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/51dbc8a85511e8551273b18d5936509f/10006769141.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gidinuxagiru.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/17115881712.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/72098951218.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9e1e23e9fba227cbd5d3e18a6f19a179/37132568245.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/79294184893.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/pimanomowugon.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/nesorotukeserizijev.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/wusofisojasalaguvonu.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/98786740298.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/30227116408.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/likakogemodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+nba+2k13+androidPDF 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_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 19180 bytes
SHA-256: ef6b4df242390cfa80255d6e2d3a251e4040ceffdc30a813584414a2babec1dc
font_01_sfnt_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 10508 bytes
SHA-256: 8adc484a2c4feba003e9b894e8dc26b9471ea1b232ab17ba6a5cfc4e71d7a8f5
font_02_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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