Malicious PDF — malware analysis report

Static analysis result for SHA-256 155ee3e529aec38d…

MALICIOUS

PDF

81.7 KB Created: 2021-06-18 22:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 699b3923a8f6db083ac67729bd09ada0 SHA-1: fc6b74097ae6d3f4c430e6aec492a13edde2b518 SHA-256: 155ee3e529aec38dd8238b4a716d496cfdbb2b3a8180db761a7c900a16d2849b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many of which point to compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0742d6a6c6---72780358518.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lelukejitene.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/janipobe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4b8273c8---nomikakixukazo.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/91232111651.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xebetavujugirumufafe.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0bffbbdc6---wetalejusuguf.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/15683726625.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dcdfa5694---57932754880.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a17e8e58819ef5853ba71655670dd244/jufimojagozipudisotoz.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b66690a---futuwojuvanaguwadowoj.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/735aad11f181d4b7d8360a6ebb8f8de1/lenoleteluvon.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/055758878cc2cf1cd651d9efea6c7bff/logubojirufobefikopil.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d17e869266576282395823ef9374c760/rosiruvuxew.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095a22340d0b---xorufudovorarenimamok.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53069723618.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/pewuzokufelemir.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/gitasofopuriki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=a+lawyer+writes+3rd+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 5384 bytes
SHA-256: 0fe640d8393d3f9b318799f69fe6763b92e775e56f9d223520ccf17801e6bdb2
font_01_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 11452 bytes
SHA-256: e25b570291c5873838aa526de2dc3d328d4d3bac2f118dc2218d74087593aa51

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