Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb6a72ba93079bf…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 03:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1716ef91e9154648e18d92092f237b5 SHA-1: b705c322f83c932ff41977a14f13857f4adcc1bd SHA-256: dbb6a72ba93079bff01df133922ab95febfdeb389f318035897ab3baa855467b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6dfe9b1d---17928500701.pdf
    • http://oreade-breche.fr/userfiles/file/pufapidivazorefilajemaxuw.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/76220289150.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e3b0c467---6939678144.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae80bfce3---xezawekawelawedufadomeli.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c760d3051139915a296757190b641f88/lukesot.pdf
    • http://www.lugashotel.com/data/editorfile/8752415358.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4a034427---sapefaxexiroj.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197221c187---mokipanu.pdf
    • http://dzbnf.com/upload/file///92138217531.pdf
    • http://notarbrazda.cz/userfiles/file/15611404651.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609341c9418c1---16897489439.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee62b285c8---66440592720.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5ffcebd0---xiwajaxekazevafuxojusavi.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/56614833366.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/937lqc99o3dc0egejc2f9t03kf/poxewereb.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607526f3ae68a---68407288452.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u9fhaer8k52ovs781v6g2qms8d/tejinenifeduwudakawe.pdf
    • http://ridendo.cz/files/file/81266002920.pdf
    • http://consulcongress.it/uploads/assets/file/rubunalewesefebumojon.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c74efd3ecf09d4044b70cbfc477910e2/64997468488.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1a6f0ff6---72874500687.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c82vdgn5asfh7hap3dci90a9uo/lenus.pdf
    • https://systematix.pl/userfiles/file/purarilodusebadip.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/86b76a2b262f7b9e3835bceeacc473bc/44130802468.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/77bb67e837a584f970bb6e96024510c6/dezisujetuxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=i+dont+care+i+love+it+song
    • 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_off0000f3b2.bin
509629a5cdcb2e262f72393fcab2f1074b79aa44efb71bf4b3830dcebc877b06
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 17916 bytes
font_01_sfnt_off0001225d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16792 bytes
font_02_sfnt_off00013a74.bin
48705e1b46341417a4c518d2c2569f0f981a291bb2921c76a0d4c097edc6b6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 10564 bytes