Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1460bf1056ce3d…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 13:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fdce8cdad72fda5f7bc9a8af099de08 SHA-1: d8bfba199c3b4ccb4e6ae6ffcc317616a2d5d0f5 SHA-256: ab1460bf1056ce3d2a9af17a5f6b3f6c658537f2bde2720b2db99af9771cb1b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and link farm heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://batikatravels.com/userfiles/file/lizukejazeme.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8252a35cd---kisuribodakuto.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/671e418bf71983a50ec6f347ee087ec9/puwizolokosemefi.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca020f79830---65571324907.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/wowekuduketosako.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/11507688211.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21ac269b8d---pejenelaneri.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb1db3add---salibunuborubebo.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac2638f0e---gitixulefugalotuto.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5e4f0ec2---27015863984.pdf
    • http://www.srijonihealinghome.com/fckimages/file/jiset.pdf
    • http://bioscipublisher.com/files/upfiles/file/76777661452.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3eb810439---zumumekumupevipudalad.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/db3567ef6cf0ada135def60321d38933/15870453732.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b05db09de4b---xudawirozeti.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/4634807479.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097561f216b3---82984386688.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+answer+what%27s+your+expected+salary
    • 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_off0000e278.bin
a3b89ee009e77c6433a27b8221db35914825865736259dda5e28dac50ca93328
pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 10948 bytes
font_01_sfnt_off0000fbea.bin
f4ed825bc8055a9ac181b69f71f450055219b97766f8a9831de0bec14bf082b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16980 bytes
font_02_sfnt_off000127c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 16792 bytes