Malicious PDF — malware analysis report

Static analysis result for SHA-256 f825e19f5aff41b2…

MALICIOUS

PDF

93.9 KB Created: 2021-06-25 21:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45b9fd555c3a114852968e3f53b46473 SHA-1: 7f2216ad6b31d2f10e3c2ee724991f80cb13f934 SHA-256: f825e19f5aff41b265b82f54c84e6eef18ca23c6d3efd32e41c0c84cbb363044
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of multiple distinct hosts and a high number of links suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73f2e4805---nuxenotalovekozubogifub.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8f515e3fd---dolizevutekemub.pdfIn PDF document text
    • http://allycatering.com/userfiles/vonipafubepasux.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/dajigilikegedewove.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2ff2pr9dtdi9gsmdj0pqe5br6h/51151234766.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/46990782817.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/882c2025846429d69a6447452aec1faf/79882044025.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ee13bf588ef2f3a3211e26c28da6d407/junonerasasupodi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d94701b7---98024428334.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608363a2c065f---16146887050.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/pasajarufezurajuju.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1028c26a332d653d23b15e8a146919a3/71822189453.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871965e6006---12284838871.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/15599012343.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/ponizimemejobomegimixonu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g34g1m9f3memkkvgm0cst7nr4v/46735201191.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/75f14a0583ff43849f3c7a32bbe5cc44/54651913372.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tobejubizijotel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608761b44a4ff.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8349916edb---zugekowinamozonafetumikug.pdfIn PDF document text
    • http://bociany.sk/media/file/29242333382.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/56ba023463c0208bcaa69d5293fdc534/81803191008.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9bu2mson4g4s5e5ilh2fn6jmq4/kimaxoge.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5a867f297da3d1c949af783ae48324b0/88868298090.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/7leg306mncekohad4j0668k0oa/kakiximuva.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/297814051.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609912ddb0af7---bumalugobida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=questions+about+space+and+answersPDF 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_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 10844 bytes
SHA-256: 1c5ce9f6859fe12a17c3ff60395c70fc5f7568699bf6601dbcf8956d9c6ead8c
font_01_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16952 bytes
SHA-256: abf7d4726a01dc26e4c62814e1058729f194263de8e119ea552590ff0237edbd
font_02_sfnt_off00015049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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