Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e3b0f96dc90adb…

MALICIOUS

PDF

102.8 KB Created: 2021-06-26 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 77d6311f2072fe989e76287a3c2eee45 SHA-1: 89599043d6bdc83176f400641de67b1309f6b940 SHA-256: 40e3b0f96dc90adbc96fb95cf777dd5ae815474af561ce8d8c7943a517b9ce3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c814eab8b1---fejesadiredimatevad.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1rrvn4ta0oi9mp0nf644jo1483/noxokafi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925052706b---2983415226.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1ceba117---81335687526.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d58cf384f5---47564832630.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d3495ovn1e1qcc8qsho0p213f7/porojusaduz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/19778314594.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a02f4ba1e---88214812323.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f4eb968d---58591397559.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/29290946198.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/fagovavufajimetili.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ff35cafe---77867884831.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce116c594---maxewaxozoso.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/f713151ce46662c3ee9433cf4d81ad5f/23422828822.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/40711529333.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/58766943967.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/30838465602.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608648bc46a91---29515238697.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/6a54352d3cba4909f1217665d4a2ac7f/35886590640.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/buruwikumamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=savage+love+piano+notes+easyPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10580 bytes
SHA-256: 7d797644e7e365648b72ab73d44a2517f8a31b8baaee730586a590ca8c9beab4
font_01_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 16540 bytes
SHA-256: cc304641fc5876a5799cbf3fea3381909c4e8d020b95fe73557336798fa28507
font_02_sfnt_off000143bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCF 18368 bytes
SHA-256: a72d103a668373b05660863c4d95c1f66c978db41072c182d629481542bc7483

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