Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4b1b7e45c191c5…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 23:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f22e382c1afbb402ef237203ee0d400 SHA-1: 6ab5e741138ef248802ec2560cea7758876ca831 SHA-256: 3d4b1b7e45c191c59a7c03c61b96cbd19be49ebec5155c8081994c8edc17ab9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is unreadable, but the link farm behavior is evident from the heuristics and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4495c331dbf760fb846dca7e1bb1077a/63742560042.pdf In PDF document text
    • http://elfobchod.cz/foto/Image/file/sopin.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160845c5c5d886---sugonanejawigajusol.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3e3446cbb57f88727c3f2765fd9e6d40/79939607166.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4f4cba1046ee29fa544f9b4fe76e8129/82256268.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/zofebomageluw.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/lewofokujizelufomofikoj.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084f19b93468---62208113075.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/9033387217.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/98024864898.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/25979988395.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zedovotufidegasetanim.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f88a9dc88a239ce356efa6740e80b91d/28063531426.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/75689570087.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c74c947ad---45852908656.pdfIn PDF document text
    • http://atya.eu/files/file/kizotobabefanuvofeniwib.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105022232112812.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/juziwodijiwivunakaravewe.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/winexigemudatasiginije.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde38ef7b0---38801276247.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tisemeraxalevagoluwe.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/564oqc2cs7nu2nj51e57hvrch4/70171194449.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8quqnketsfu8err79d6ntfs35n/57908030295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=computer+vision+python+pdfPDF 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_off0000b6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 15184 bytes
SHA-256: 356434561b1a28b1132bd0e89f3d74852ef3847e218549e1f18e9a36e8001213
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10868 bytes
SHA-256: 99682108b98ef8290e4a04263270431630c1ba394910b67ea40bf324672b462f
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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