Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28436a6f6b4f8cb…

MALICIOUS

PDF

96.3 KB Created: 2021-06-29 12:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de96c0ff5e1d8cd484d16f41793b534c SHA-1: 819878a813818961690ba61d4e4f4a25ee266691 SHA-256: f28436a6f6b4f8cb6ea85984557540d317254950fc858fb597c025d0bf022c9c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of these links indicates the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071792b3a11b---31148352982.pdf
    • http://cascinamana.it/userfiles/file/71590769744.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ekodcff5m0vm48mtf41dl1g01s/dalojuxidomijupexasovet.pdf
    • http://computer-rudolstadt.de/upload/file/57380729956.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8b71a129---setorofilo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f53b044b---tubuzasij.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c92c47fe18db32c16bb0c546d1af519b/20836722816.pdf
    • http://gostinica-domodedovo.ru/files/fevipata.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/49718098454.pdf
    • http://saltokisport.com/uploads/files/78630785604.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c37hdro7v2l1ai7m4dui274uh4/16879300628.pdf
    • http://studioassociatoemc.com/userfiles/files/gijanizipoduwisuv.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160733e059591d---diwigewipofimabejaw.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/37618534958.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c3pm30013k6aqa94cbd7sv46n0/21694942214.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a238bd548---gukilu.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609458bf7eb87---pivezaliwiroparalu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/697932189i0b4uc1k00dq43m5v/22758636219.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/814894272f7b6fd606693f14db1601ef/solomenozu.pdf
    • https://artbynela.com/uploads/file/visafenulesekasuwutexel.pdf
    • https://najlepsze-w-polsce.pl/uploads/dixabawezabemesejajavixu.pdf
    • http://bocghedanang.com/media/ftp/file/namapuzoma.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bless+the+lord+oh+my+soul+verse
    • 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_off0001164d.bin
957c5bdd33befb6668b0364e0e1b7cc40154cd4c3cc6346fa969498b649334b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10488 bytes
font_01_sfnt_off00012e41.bin
78ced42ef4030e5a1674b4ea8d6e22909165c929f19b4bcc7e5168914ae135fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 17544 bytes
font_02_sfnt_off00015c07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C07 16792 bytes