Malicious PDF — malware analysis report

Static analysis result for SHA-256 8291f59a263fbea0…

MALICIOUS

PDF

95.7 KB Created: 2021-09-03 19:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a0c7217b1a1371d252125602ee0bc97 SHA-1: 0df4d725bd0788d5a29e7ece4f3ce248680a30fc SHA-256: 8291f59a263fbea09991e0860fda32782af85e5a79f777ecc1a7bef54aa2ca0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/69449792106.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1ea9npo5qho32trctj291j3t6t/91080686952.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0e16b320---zadodasifedevabekerekubar.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/neriniporafozixevol.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/90725635097.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/50903549687.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/45316495750.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/jijeg.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/73310988580.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/dododorawumepudunibab.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210531021131.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/jemaloramoja.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mn8j2i2hk5d9pvmlq26g4u101p/34249986569.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/62141053403.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/93979964324.pdfIn PDF document text
    • http://rld-carbon.ru/file/sekikalodotij.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/ruborozetabuberoxobugop.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/1462476488.pdfIn PDF document text
    • https://zzhqhi.com/d/files/wotumepitor.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/48052614915.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210525162193890011.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d5f86f8093bb329a103e2953a558d217/bexekubuxoref.pdfIn PDF document text
    • https://masukpt1.com/contents/files/60864631143.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62ac8e13382ba15e866dd06c761b4de3/dilakefujagozilis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=8th+grade+math+distributive+property+worksheetsPDF 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_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 11396 bytes
SHA-256: 5218e5a85d0eeb714544fa94b0834eea2ba36db45d234a40612a2f707ac73702
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 19784 bytes
SHA-256: 361e18e88ae763038cb57648599eeecd342cffcbd0ce6c1f3140cd8c96c8fcf6

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