Malicious PDF — malware analysis report

Static analysis result for SHA-256 e155b81208ccb82e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 08:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16dc34c52f8e502308b1b59b8e9d333c SHA-1: f56ea9dd1382c276dda9431a3a8cf01bc39f5b55 SHA-256: e155b81208ccb82eac6dec22de90505d1d5febd3cc4d4a86e9063a45bf3363ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple PDF link farm heuristics points to a deliberate effort to obscure the true destination of the links, likely to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://drafthe.ru/uplcv?utm_term=the+power+of+now+by+eckhart+tolle+pdf+free+download PDF link annotation
    • http://ladna.pl/user_images/file/77041553073.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/gejirolekinomawamive.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/wogepoloborezulolapaxurep.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/dusupakatijabowukidowi.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/85404155352.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/b888f266991e3aa80aef89cbb2d3b359/16376853602.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/07466ab0c64aaa42f17523c40f296d30/32859787697.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7f883bd---91586999644.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/noxerimomej.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/23974747435.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/99083297041.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/55304396011.pdfIn PDF document text
    • http://greenglobepms.com/uploads/22376833556.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wamiraridemagorosok.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dozakuzu.pdfIn PDF document text
    • https://samowar.ch/upload/file/pabobolipipewokatonogase.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/83807880690.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/kiditijafakorutaz.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/29020424158.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/15232240933.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/legikikojuvaji.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jewabuwipinu.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/jizaxor.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/muxixunododaxujutofemow.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/wosoxo.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/67076811099.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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 18360 bytes
SHA-256: c334d4647259d07f82e53ccfe98daa95488de1932a2128a65dc2973bbe4e8137
font_01_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 10852 bytes
SHA-256: 3bd951c6aed0bd418c9dc77052aed3806e35363ad817cf4bfeae07af4e1af8e5
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1