Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c10a28da7ddb922…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aec59f41b9fe802a03cdad84f170cee6 SHA-1: de5d91edadc541c133eb5967fd8af2daf03b7a80 SHA-256: 3c10a28da7ddb922c5410bc52bddea17adf557de25145228fe0a7e6e72af1069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=os+orixas+da+umbanda+pdf PDF link annotation
    • http://ippon.lv/uploads/File/buxiweramukuw.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jizobubikebadu.pdfIn PDF document text
    • http://iucecb.com/files/file/mujegiketemuvuluxa.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9be0a836d34c36d5ceca05124a3d0216/16795909358.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/zabakesujegi.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/69916352823.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1448baa19689d93e2ed02b42481f502b/toguzedebikoxosi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/23688763113.pdfIn PDF document text
    • http://119pump.net/d/files/libaromonupanepe.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5793f5cfff---sevezodivudufol.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/nudodekos.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/refunatupinozuwusexa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cb830ac1---18417008633.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46b1cfedc---26546421602.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/volirufujosugek.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/49542500505.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sebegej.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/58v06d3i101adiqr2fuhn7hc57/92414090012.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5aa4e759eff466a5d8e846988ee7f6b9/9833658585.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ot7adhmoab9hvtfg2ag78ro04b/kovojaxe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba9603c7---duzagezobezovivegarev.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/fixol.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r85gbag6anqk1ig0qph52e4og0/48288474549.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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 20152 bytes
SHA-256: 2e044f11cf3d87112df594fc88281495d514e9382190213520149159beb884f2
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10752 bytes
SHA-256: cf283cabbb9c3c1bbda4ebf02c3e6bbfcb8ba1efea99a3b6b66cfb118562b770
font_02_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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