Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d20ff2811bbad95…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 11:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17529f85ecb056f45e3afed38bd1abf9 SHA-1: 2fc8f23e918e07c8d3161fc04bf591bd6e99a972 SHA-256: 2d20ff2811bbad95d6cbe029bd31c8b1d25c3259f94d134d929bb2f4771a41a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ville-saintleonard.fr/pdf/vatuduxa.pdf In PDF document text
    • https://netlandschool.cl/files/lutaluxenakenasesugesiv.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/zilupamiropotevasuronev.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd977912ae---jexamom.pdfIn PDF document text
    • https://termoformat.md/img/files/84623406271.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1a03a977---polosojabi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/20570364515.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a082795f2e---waxozaxako.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/dodibutin.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/16978960597.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9cc85b119d3503f55566103db7dfc5c0/josopivadudakufitebexokus.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/11638118507.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/somonof.pdfIn PDF document text
    • http://licausi.it/userfiles/files/44349374981.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/gokoxejo.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/kebomet.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d31fb54ffe---beloperejuwizasunexaku.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4c681e2d---zodubex.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0193729001620643695.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/22598813193.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a2e3effc---mimakemelogotenegikopota.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/gotikujaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kinematic+viscosity+of+air+at+room+temperaturePDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 17736 bytes
SHA-256: 40165d5e004da947be6f2041121ff564b11cfbffaaf914ae6b056c3694bc9cc6
font_02_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10868 bytes
SHA-256: a01ac80b7409ce5fe7215dd1e2fb22201d92b70fdb2cff143f4b950efc35c2de

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