Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fc3bdad475aba2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 21:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7d789254ea44c110bb8ec09a2e8649d SHA-1: 5ff20a87a39070adecaf813bd86cdb57475e8fc8 SHA-256: e6fc3bdad475aba26c48efceba044c0f090702aecc39ba8a763f44c13be13268
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous links pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing attempts, aligning with the 'Pdf.Phishing.Trojan' detection. The primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864db5c1739---pavolamedapibafaviludu.pdf
    • https://loyallcanada.ca/editor_files/file/baxewewevedesubuxujufumiv.pdf
    • http://farmaciafasolis.eu/userfiles/files/87759655205.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1dc28ef9bcdee77d26ff8184cae84ab4/90673433531.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6f865c76586c33fc4e05ec6c3cabed0c/vegesolawonuwadixawabun.pdf
    • http://watsonwilliamsreunion.com/clients/82103/File/voxomasiwadinufiweja.pdf
    • http://praguetransfer.com/files/file/rukuvutive.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ba63533f5880bde020ebc0e4d9b9ab59/dizawelusiropatuzuge.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e764123003---26526730455.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ffabdeeb0---vubedagogivuxubo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33ff5398d---xifijawakozubedu.pdf
    • http://pamat.ro/UserFiles/file/58737834282.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/16088922587.pdf
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/gebuvo.pdf
    • http://vladjurnalist.ru/archive/file/57937164769.pdf
    • http://language-coach.pl/uploads/files/fexivadepomowudo.pdf
    • http://truhlarstvisollner.cz/data/file/mepujif.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a8e4d8df---27058516398.pdf
    • http://h-n-s.net/userfiles/file/zapizevenadowipabi.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e6aba29f4949f393ba3393098b542272/wagomobosujus.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdf
    • https://barcelonacentromedico.es/files/galeria/files/90254164817.pdf
    • http://allnatureint.com/userfiles/file/10877350082.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2009+infiniti+fx50+owner%27s+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44a.bin
254542f4ffd63a990fc51b316429f85184999289a69815d48f6c7643e6fb6381
pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 11144 bytes
font_01_sfnt_off0000de84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16792 bytes
font_02_sfnt_off0000f696.bin
7359c2ac68e1e1aa67ef8f1809bac4db448916a0b0426740ba44a53643234510
pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 19108 bytes