Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f2a0cc24e229a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 12:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbafc065e77f23606f3279dd5f971d0b SHA-1: bb08721f44975d127f1f19de15c0ea7ca8622a58 SHA-256: 812f2a0cc24e229ae23a13b8cc973a98581834cfa8e34012b1ff5af7ef5bdd4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=mmo+offline+android PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/27325511504.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-15/images/files/81027804835.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/82651731995.pdfIn PDF document text
    • http://huntland.hu/upload/file/36996293465.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbef356de---7275250009.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6916adaaaffa51c1a7e1cbd7f669c1a9/zomalusidor.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/63068968233.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341ea501fe1---goxoxitasevuzaji.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/teximikugalirove.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613923f3d51aa---muvisivolexunuxoredawigog.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/fokotikatilefinus.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/57064399569.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/nivudofaluwuzu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410ff66fab1---50946293565.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/33105607189.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100422476422.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/gonajizafowi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140041c4090c---latalebabenuw.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/42206885868.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/lozesigapirojo.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/zezinud.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614d192336984---23078694149.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 17420 bytes
SHA-256: db529b44545faef924c4c41f6cce5d1f5f122f49d8426f1463d71838c48b9c1b
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10240 bytes
SHA-256: e3c1bd9f3eeda89a06aa83aa50ab3f067c29d731892aae90d7ecdf0c2211741f
font_02_sfnt_off00011787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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