Malicious PDF — malware analysis report

Static analysis result for SHA-256 13abfe3a19c0e1cd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 11:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33a3df87f598b9bb1b33b1bd3ebf9344 SHA-1: d86d0b9f83042fe5b200ebf54e77cdeb4db6aded SHA-256: 13abfe3a19c0e1cd94c97e63acea5fa5b1f4d665f421ca224d681977ca5ea8d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, many of which are likely compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://weilandensemble.nl/ckfinder/userfiles/files/85511772851.pdf In PDF document text
    • https://global-product.org/CKEdit/upload/files/bemadekikume.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/5084434482.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/jugixozadimofufagonigevo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614379988a24b---97444368219.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/60823368685.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/54174716280.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/16159809153.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907175854673653.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/menatotusewojun.pdfIn PDF document text
    • http://grafitym.kz/files/file/38755849581.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630590486/files/neviwov.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/ruvumozusuwag.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/xitedeba.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/96362883654.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc5b644b2---66845604642.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jitaz.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/tanarokosaju.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/75335891282.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/6952840416.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/636249176.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/6836429528.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161377f288df57---50867007191.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bosibagum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=snapchat+rooted+androidPDF 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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 10472 bytes
SHA-256: 714489503e185311b7775841d811a5ec2c70ebbf6591dac757ee504034ebc173
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 17280 bytes
SHA-256: 182b0db802eb269d25e390e97cbc2c3eb707b3c79cb306c88e3292339f1d3147

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