Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaa48cc9921e811…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 10:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2e93a51e07deceffc6bcebe35c01c9b SHA-1: 73a98c8af4d2c95b8deba98fc61bd7a080fa0c17 SHA-256: feaa48cc9921e81127f4d3df15a889a8e1950d1bbd23bad953ce6700a299f062
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, indicating an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krevue.cz/UserFiles/File/74738533868.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184532d188---vefaxadato.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/suteratanulupesejefavej.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/faxenamuvu.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091300093054.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/2219026897.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/gerekipozadoxuridosipemew.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/53750812870.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sanepikovowuga.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/reves.pdfIn PDF document text
    • http://deltools.com/userfiles/file/83021748396.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb41b28a0d---78079949026.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/821278259.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/rotetoriguse.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/31751007565.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/55103803488.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vuvufokep.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0d06d52b---1620268192.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82698004158.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614878ffea0a1---27403883524.pdfIn PDF document text
    • http://status.cz/UserFiles/File/vozafan.pdfIn PDF document text
    • http://acril.ru/ufiles/files/53814029476.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/zamafetowumix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+film+kill+itPDF 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_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 10296 bytes
SHA-256: 138bc9157a8a763885318bff546f9ea4b83638341ce0abcf331f9fbd3e026ce2
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 18684 bytes
SHA-256: c6892ba729c14040403ce780e847f9be72799e66f63e8e6b71debf754faf0fbc
font_02_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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