Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53338b638736949…

MALICIOUS

PDF

68.0 KB Created: 2021-09-24 00:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3b33d6fe67f59ac4ed1d14b163dc184 SHA-1: 4ed49206b717ed4ec4d4fe5ac10f6d88be3e8027 SHA-256: d53338b6387369496a73e8336291931f7e9ec4dd5958960cb41b3bc7c3a01145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alternativecarrepair.com/userfiles/file/61701216591.pdf In PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/7122826467.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/mojobipiwadazalanoture.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/kefojawiwedumudogezoregas.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/25090221486.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/lizabirowotobuperilurod.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/14aa2cc82351c3ca22c8b623c45dd971/mijov.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1c523b722f2add9ef1ba78ad4218488e/zejonu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/77652370746.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613B0D8916EA7.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/73461685553.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/36669581353.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/66150051627.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/8170491921.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/82958d2e43eb27cf2791735fd2592c42/51444218776.pdfIn PDF document text
    • https://architektor.ru/uploads/file/vomuwa.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/31313191393.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kevaxapozimafibag.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/34034923813.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631757767.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/67725127881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+3+online+play+nowPDF 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_off0000af93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF93 10388 bytes
SHA-256: 183bd12b524beb28fd969784eee9675fbb2dbf87505acef39c41bd8ad8979b34
font_01_sfnt_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 14332 bytes
SHA-256: c64fc3f1fd8ee493ec5301fb6213b2b5833b3996e1e99f562a9ee654024c04c2
font_02_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1