Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1eb13e7cd9ca6af…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 01:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 528f304334917e69051684dc73eea140 SHA-1: 5e0ab398d7d5d31d02fc94d8950f969f5455ecc8 SHA-256: a1eb13e7cd9ca6af95db6e6584d039ade50cf755d3fa523d00853f947a9d38f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, presenting numerous URLs on disposable hosting, likely to redirect users to malicious sites or download further payloads. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=can+i+lay+a+fridge+freezer+down+to+transport+it PDF link annotation
    • http://salamino.pl/userfiles/file/20901846597.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kifenitiz.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/gixeruxitopusisaxijikuj.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/fogigikorubasul.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/70357801926.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/68318416707.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/dapezodalubapakuwomi.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65567148631.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/tosut.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/14481910866.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/xugipeziludetalulenelo.pdfIn PDF document text
    • http://ministerium.pt/files/munitibugogeg.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a6206b7f5---konovas.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/37493971168.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161425c9443c1b---19215578137.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dd417790397b9e19b3bea60658f65b9f/48473773974.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614024c6518e8---tabatobu.pdfIn PDF document text
    • http://js-space.de/userfiles/file/5633222823.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/99633888428.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/54084647117.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/22663550705.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/69395501705.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/99531334023.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_off0000b2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 16804 bytes
SHA-256: 2c1b81977a0862a08dfe7e20f0cf4e4eb255b26b231cb0874691de373cd3c004
font_02_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10964 bytes
SHA-256: d185e9e9f826f42c66b9508069dcaf5f9bdacb585d89fe41f99a6b06643f2aab

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