Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd060416b4538e1…

MALICIOUS

PDF

103.7 KB Created: 2021-08-21 10:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6f8120b3059d8f7db561deca7b9427e SHA-1: 39646f9e95af531abf624531cf98f5d887e74962 SHA-256: 4fd060416b4538e171075c8d2b520fbb2320ba4edf179e6a80eb0f882674d3d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://aweibel.com/Photo/file/fubuvot.pdf In PDF document text
    • http://chrislahoda.ca/userfiles/file/45995742875.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/45670136057.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hbq6ffii4j02c5mgadhl3m8f7e/wujezegajuvux.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/84845687815.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/suribokawifezajonafinav.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/939145468abb0afc0a366baa23fc717b/kawitusemupuzevi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6eefa8f5d---xemikofujojot.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/77226165348.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721fcd72637---dimomojenobunuwejiganaxod.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/vojibelinesol.pdfIn PDF document text
    • http://erex.hu/upload/file/pusatefoferofusukidisuwut.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/pitogixexebib.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd450b504---xijojazipesabagojala.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91577ad368---momisasunuxola.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/sekuxu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/nejus.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160797d3e5fb8d---20915259918.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/betadudegasatem.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/mesagozipop.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77bcf3412---89421197299.pdfIn PDF document text
    • http://keitbg.com/images/files/gufufirakazoduk.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/lemide.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04cf72659b---jedoseb.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a3d3c396a098e6786b12191c729ad0de/kadofesitamosejipo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3af6e1d58---10013497267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=que+es+un+presupuesto+de+cobranzaPDF 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_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 10728 bytes
SHA-256: e8687c9f972ad1061297ba131c644f38bcb321dc34ea22fe6f2cf0f95abaf9b7
font_01_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 18884 bytes
SHA-256: f70a9d48de378125b768d0c5b43a45dde65f4308b0ca3adf4be8d365d32dab34
font_02_sfnt_off000175fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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