Malicious PDF — malware analysis report

Static analysis result for SHA-256 29325cf3ef36f03b…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 05:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 264ddc7ae4829fe64f3e4129c66a7d35 SHA-1: 9b2d77e8ed06685964808b7691c111ba4ee8094c SHA-256: 29325cf3ef36f03bde259e2751c9da90acc6e1fe595040495cfd4d5d454883f0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, a common technique for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple malicious links suggests the document's purpose is to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6668b099a---11953579790.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817de2c1b8f---mopeputuvonoza.pdf
    • http://birzebbugastpetersfc.com/files/file/85332741098.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c3e301116---tuketunisapuvilatotusuje.pdf
    • http://emailreceptionist.net/userfiles/file/gipidadobawuzunu.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6dad99a9b8ab4e350c0c9a4385fd94e0/sewonev.pdf
    • http://sieuthikhoacaocap.vn/upload/files/74303688753.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b5122837---83764816460.pdf
    • https://areicon.com/images/file/53517392711.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4dff2448---weneseruzukokalavo.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/act0incfjair3oapmffn6a9tqf/26631230196.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160932f0cec242---86484094931.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6539b17f6---lorekidiwojila.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/25458217444.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb7369e89---manurusamefudaz.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/55268104307.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/67808072897.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac11813d4---xegovumibavowubidimesa.pdf
    • http://rymwid-training.com/userfiles/file/vazizojoled.pdf
    • http://asupuro.com/user_data/image//file/31663083556.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdf
    • http://sam-global.ch/files/file/75877568382.pdf
    • http://kientrucphatloc.com/upload/files/bopefurefidejobagereb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chapter+16+determinants+of+the+money+supply
    • 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_off0000ee60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 16792 bytes
font_01_sfnt_off00010677.bin
018f6b9827cdd43f8e333a1cd0d94cbb352dbb46278034c476509939e5d978ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 11228 bytes
font_02_sfnt_off000120ba.bin
75b3696bb4771dbe4ea51652e8e12c64cbe349b2c0b8f93461ab2da68a33eeb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 17648 bytes