Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d9a4bc3d4d1dde…

MALICIOUS

PDF

83.6 KB Created: 2021-07-05 21:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2728ac2fb62e7114c9326407d53419af SHA-1: d5481b4758c160c16d28dc6a823f7f8a0e5c0cbf SHA-256: f6d9a4bc3d4d1dde0c5ca64849ece7c6a584a287a79958b7121e1fdf6c503a56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting it functions as a link farm to distribute phishing or malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4f91401c---19884432060.pdf In PDF document text
    • http://sugarfree-gelato.com/upload/file/teretuj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075110dd045f---10568757219.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bac92658c50---31172103129.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/05c9b9e43b3f7ab644b57d84c15c184c/sotuxurolesisumeverukizo.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/nusawafetojizuvepibapu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/fibesoger.pdfIn PDF document text
    • http://metallpress.ru/files/86940065308.pdfIn PDF document text
    • https://tantecoccole016.it/file/fonolirovi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/repegibomipasepowazur.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7fefb8ce8---lunumofaripofuresixe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f465559f0---92323265164.pdfPDF link annotation
    • http://zimmerei-possert.at/77293561798.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/vatuvididusizojud.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99731627573.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/pukedovu.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/derazomakegefegem.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63c8b0666---61481316060.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b086e1b23---fulekufasemifagizaxekep.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/36815123319.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac13982b---28141989468.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hul2l7f3nuk2t2hs7brnsp7hc0/xavopijamebenumekefi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6704c8b4b8eb3745c9540e7f59d4e92a/zurumazaguruzumiziv.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tigazexularosuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=litres+per+100km+to+mpgPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 17648 bytes
SHA-256: 3719e68b0b7e8a9cf417d6bcc4bb52d22019a141f0bf74b3cb79059947e03659
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 10504 bytes
SHA-256: a7be0e67054193f114fbae318ec7033b85fbb8d46118309e9e24b762387fceba
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.