Malicious PDF — malware analysis report

Static analysis result for SHA-256 01693c1a0f474e6b…

MALICIOUS

PDF

90.3 KB Created: 2021-07-29 17:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6debd62c170bc0f69a7482696ad583c2 SHA-1: b1443c8904d878f41c21394f407c5a0541243baa SHA-256: 01693c1a0f474e6b11700acd8feab336a8a4e9c785795907152559f57daba855
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The presence of multiple PDF link farm heuristics points to a deliberate attempt to distribute traffic across various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artospace.com/pics/file/36819936980.pdf In PDF document text
    • https://dansobentre.net/uploads/file/2916160324.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/bidesezamigi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede4f07b961---xexalonojenudene.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/35460617813.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/70037551233.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/binutobepuxa.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ab46hbdeqaralq3niqhiciqpj9/77316935028.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c1ksa3fns2ujtv2kqea6v3o8f6/25645190389.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16078468bdda43---55045642047.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/87902059750.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/rikemawajawamepegewuwesa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7dsjm23rc5l0otj8s9qig5q0p6/negik.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/52322497674.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/wukejazixurubizugizopip.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ur4dtvqk9mr72ks9q3udbq0mj3/mexobekulurewawiwowek.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/69606483654.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vidizevafof.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/7799061908.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/5522735158.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/ramuzenakojugexo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/fegopidabanajavupametotiw.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/s8odlk1nkmpbskc3f6o6n1im9t/dixakofixuje.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d3ad3abf2c6d8d0c8f68e51725dfbc01/36079145965.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7a6649860eebabfb3934e57af436f84e/64921221523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+are+some+advantages+of+asexual+reproduction+over+sexual+reproduction+brainlyPDF 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_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 11584 bytes
SHA-256: 6396cb8f50a635127b9cb1c1ea14e3fc22eb933f5ba18b079c9e40784ba77d1d
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 17496 bytes
SHA-256: 1272c7a12c0bb84eea909699c194c411940282ace2a9e1cf2c465313303180ac