Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bddd479dcaa9415…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 18:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 04a30bb90c76c527135ff6b8de77032d SHA-1: 6f0c992f1f338e49c1769edc14c405f52c023417 SHA-256: 4bddd479dcaa94152b3a6c27fd3568e777e991bec5b434bc8039cd93803b889d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on compromised CMS uploads or disposable hosting, characteristic of a link farm. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://100gastro.cz/soubory/files/67624621876.pdf In PDF document text
    • http://myucpb.com/userfiles/file/53589618504.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9341678364.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/teliwegilezimi.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/vozodegoxav.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/12737108695.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323df49584a---30579008497.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/zopazeruro.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/forejubadosogoge.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/mapawiwanidanoruwubepi.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/livanebusofawiperopu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19b87b5ba---83165142917.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/tixamuzolivola.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/33304103614.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/39831871410.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5301625528b23bb456e421fb9688942a/rerunov.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/6936268812.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/22837714657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+internet+apn+settings+2020PDF 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_off0000cefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 10480 bytes
SHA-256: 6de4f0dd08d3e188f73fba9c289fe04fb29c04ab56e166f3ab833fa52cf7b20d
font_02_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 16684 bytes
SHA-256: 359d6436f7f6ccb5b619f1bae01f0057e1e70a015ab79612faa5061997e9c5a0

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