Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aa5604e1f4bc04…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 23:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6d762a1252de285da2b2906ebd13034 SHA-1: 0bacce85619add063d4304fc7509e10dcc39b52a SHA-256: 56aa5604e1f4bc0427a6c323e5d144f0673293475eec52d982591444599e3d60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sinners-party.de/media/file/biregovebimig.pdf In PDF document text
    • https://letstravelforacause.com/miet/assets/files/katiteneziriwuludelexu.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/12207723967.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/viruduwaxilugu.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/38419077934.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b640a2101d3cf1255eaa6abbeb2d304e/vuxuvel.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/48553080063.pdfIn PDF document text
    • http://minhanh.com/files/zuxogeranulosarab.pdfIn PDF document text
    • https://fishboat.hr/files/kufunuzafunejoji.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wofobu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/59031e3484994db6274471bc47977860/niwozixe.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/72330987200.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/kerukatelewagixosipametad.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/47430109138.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/mawapaxixabolatulonukelo.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/73015384440.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/44475245507.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lp522fsj2pdtts0ob2ccuh7a53/32674321826.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/33718330097.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/bipunatewonalegiga.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091115113012.pdfIn PDF document text
    • https://matratva.in/userfiles/file/povidinuler.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/68501016361.pdfIn PDF document text
    • http://pactolous.hu/upload/file/46446923536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pulp+fiction+watch+online+freePDF 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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 10596 bytes
SHA-256: 43309eb67effdcdcc3a76a086ac0123e51a4e70900365648b329bc943b5275d8
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 18032 bytes
SHA-256: be93c550990ed363dbf2eb845210144031996ce2a2821548574b6372bc6d7ddb
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1