Malicious PDF — malware analysis report

Static analysis result for SHA-256 4897181dcf1f7a53…

MALICIOUS

PDF

81.7 KB Created: 2021-08-28 22:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0f886dc551f246a18796286d4910d7f SHA-1: 7c8f51bb2e7fc13a01b8b593ca801d7a30433fb6 SHA-256: 4897181dcf1f7a53ee09a9fb7dbab79a67d48d0ce427481de2ce26262c396ec8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c7b95efd5---kupezagipixopapijesusor.pdf In PDF document text
    • http://tecsun-moscow.ru/docs/file/xumilogirazoxavulofo.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/328784a2f1b182e77703d731817feb42/bedezoluw.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/15960634101.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077caa9960ff---98427849606.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wekumoza.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f49cc48b1a7---fudedupotidapuniwifigabok.pdfIn PDF document text
    • http://dytac.hk/userfiles/69048611819.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/lugiriwabuzatunilebifapat.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcf9a8c864---49790263375.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/058d7fa21c53ffef16ef92553b193863/63596565837.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5eu9lbi4sns5vcvf4q99kris95/xorabegobusapagojom.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f8f419f9d6d534108b6464c66a326245/xeludijoburidedebezigibug.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/58cmk664eb3upe84efolkq7909/dusabumixojuj.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/62412150169.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tebabinoboranilasawowojuf.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/towejajeniziwaradefi.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/84703324983.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfed92ad72---5535419797.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/52383919913.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31f044f37---79768267786.pdfIn PDF document text
    • http://merwepizza.com/upload/file/65762536895.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ht6iq42lf5o8u6n6pp51p203ak/35793176128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+snapchat+video+without+holding+the+buttonPDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 17052 bytes
SHA-256: e165f31477f6041942731feebdaf5452fb9fbc17f07a526ee4a384d0aa9818b3
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 11336 bytes
SHA-256: b0cba0f490a10ba459dc8946d8add5ec0cdebc307763fb3cb0909651d8f72656

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