Malicious PDF — malware analysis report

Static analysis result for SHA-256 b346a30de350b63b…

MALICIOUS

PDF

76.7 KB Created: 2021-07-02 10:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431a40798e694031f697b50af42fc722 SHA-1: 74a2d9473c7fdd6e1d3d998c71e55fe468ceba53 SHA-256: b346a30de350b63b336c85d77b256bcaac6a5e9f771d67c5d3136443fb1259ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous unknown URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure malicious destinations or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38fbdc061---giwunigadetarides.pdf
    • http://caratow.eu/userfiles/file/ritanefutozikupununobez.pdf
    • http://dancephoto.ru/userfiles/files/56186451149.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19239ec2f---sixizoxunorobezo.pdf
    • http://lycee-elm.org/userfiles/file/sonalifibelatoxu.pdf
    • http://erbaytag.com/resimler/files/volojofuvu.pdf
    • http://alconburyreunion.com/clients/36523/File/55536715861.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be432fdaed5---81039179302.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ee763ee8813d3ca67a25ae050eff7754/54114544587.pdf
    • https://nnkcreations.com/userfiles/file/xagunasavikag.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8510013827---97012017364.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/es7crpd4s8iro1p0s5nidcu088/gatubeduzoviwowisakejigaj.pdf
    • http://trendybiz.in/usersfiles/file/kogoza.pdf
    • http://animationcoach.com/userfiles/file/zerejomaposusoze.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846cd383d45---liwazofadarajijexupuviw.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8520e0e93---xepofen.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2332b711---38782170844.pdf
    • http://phuwangnam.com/user_file/file/82097118957.pdf
    • http://jnnycc.org/userfiles/file/87686166577.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be71f493a22---10508942872.pdf
    • http://animalscipublisher.com/files/upfiles/file/25899198920.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607905d54a9cb---50833775461.pdf
    • http://mkbeauty.vn/luutru/files/gozifesajevuxinegiwepu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2615bf2f---78152303069.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wma+to+mp3+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99d.bin
2948162ca3e03b17bc67473f5c7d8d55ac810aa985ab37a3a23e44ad03ed09d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 10460 bytes
font_01_sfnt_off0000e164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 16792 bytes
font_02_sfnt_off0000f976.bin
8973391bdf867e51b5a91ce0ebc2c8cdac1a2e8d471bcc523e6e0aeb0d0331cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 17044 bytes