Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9895aeb67940b01…

MALICIOUS

PDF

81.6 KB Created: 2021-08-21 10:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d57abbfc7e8d41ab172f8913e7203a8a SHA-1: 0875186595e54d97ed905f21eca8e610d8559f41 SHA-256: b9895aeb67940b0122c635135c48f00187966072e9e7dee9c6e65be8a0c01ef8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to unknown or potentially compromised domains, suggesting it's designed to lure users to malicious sites. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://hoitruyengiaocodocvietnam.com/uploads/image/files/videfuzesilen.pdf In PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/retugabo.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/datawizagak.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/85434520388.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c89942d1bb2819f22f12b4c068f67a24/raperodesi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a494e5833c4---nivofixepujatobazali.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e92325c86---44580610998.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/wagimigewo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b6c0dd4169c5cd3ae0596e9f2ac04e61/51828061881.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210629_B873D8B9287BE760.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/573a031c9a892ea0550a822d18d3c8c7/36133789307.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/derotifaz.pdfIn PDF document text
    • https://invest.pl/userfiles/file/77397486735.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d36a395ae5e---kepavamu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608870da02ed8---9950821536.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fcf4c34d0b2c3c399becd06d76f456b0/kuzoxatuxomisaziwiloxo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/63c1969aab4c6092ea9e9d53d283a608/92596425820.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/53599261113.pdfIn PDF document text
    • http://debden.org/userfiles/file/68923150992.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/5795298435.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/875e1fd0050f6c1fd0ee25e18ee37ce4/9429659556.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ab3679900970beb99ebe815ca9ffe97/41343435206.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/66387839887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+an+example+of+a+safety+observationPDF link annotation
    • https://lapdonline.org/file/rulesubo.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 11040 bytes
SHA-256: 80cc3fb9eb7f45efb88600696b4366afa8275acf0d0c90ec0d6549a8f11a6e2e
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 16600 bytes
SHA-256: 48abd104dbe16058bb410f4642cc09e824f3cdfcdf0a52cb3d65cf3aa3222b7d