Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68c653dfca84202…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 12:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13fe59142cb2cd2eba3b6c12ddacbae3 SHA-1: 5d00a9bac3ff8842b7c465c9dc52846ea4f59504 SHA-256: f68c653dfca84202cae08332ead43f2a6b05b96c8e97b1f8c3dd42460b583ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is designed as a link farm to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=journal+chronic+suppurative+otitis+media+pdf PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rgl50dnivdq7c3tvhq98aj8mi1/24918238611.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c786311898---jobamib.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee0660944---97223921099.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/21245907982.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e99d4472b---bisomumakitutoximader.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/mugibudemogazaf.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fd2d0a365---zexegowuxowime.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-11/20210511081205154797.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e76dc66bbcd1b9bfeddd2405c8b67db/jedezakureder.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/vafitebiwugidexevefav.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fqd9fha0gnmgnvmt813olemnj6/4442224319.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/kemabaratobezefomoluza.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/86454072307.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/sonuku.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa28d1d3840---mipofituvi.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/lalifono.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/48635467337.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/2528686943.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q322etsorcd94tmodvq54vuud5/17862510052.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ad8748062079ffba99e96e3e10ca5f46/xapibeviwosepolugebavalom.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vujivef.pdfIn PDF document text
    • http://aweibel.com/Photo/file/23296438893.pdfIn PDF document text
    • 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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 11044 bytes
SHA-256: aad1860a23895de4c443ee793685d3017afc1a13cb325ea2b27e24924751fafe
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 17344 bytes
SHA-256: 6a0cd05d7c10e216f4e7a8b5c9fa2925a02ad677a5ca8a88b40cbc13b89ec91f

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