Malicious PDF — malware analysis report

Static analysis result for SHA-256 7835b62067a31700…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 14:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36e556053ab161e94ce7b5a61514e739 SHA-1: 6b49c525792cb38a3bb510fe65435b4c33c0a0e4 SHA-256: 7835b62067a31700f86943c664a538061d9a60e6884475b02ae49e5f962bd59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=ds3+attunement+cap PDF link annotation
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/xopugon.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/77102404848.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109200122508423.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/didewawukel.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137d96dbf240---43500110784.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/fefatadajasutimamupe.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sibopogopofonupakafatogi.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nevafepuli.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/zikoxuwogekojixokuf.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/67381290371.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/ridibud.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tunekolapufe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614728f434472---nepivutirej.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/dadogilame.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/67555779973.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/vunibi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0f8ed2e29c61a45c048f261581dc27d1/dapesedofume.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/97845063616.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/24728392131.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/52201357564.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jewuxetusu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbc6bf0bb---32963261779.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/vowixojepowumuxidud.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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10448 bytes
SHA-256: b8b4f82e5a6c812209c6df470e5f10cb4f9959916665fae4292479e15d786312
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 17712 bytes
SHA-256: afaa0d5aed239db59b76b980323540472785c8a0e9a22b7c1f415e70099d5a84

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