Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a168416d2490f5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 11:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d94a7f50a993ef387f3e2c5c19922d4 SHA-1: fa08b358e24f251fc68959bfd31d3c57adca2693 SHA-256: 64a168416d2490f5db1b702467f5f128948a8d4e7c76ee3f8e82d0ff0eba1e1f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised WordPress sites or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=kryminologia+b%C5%82achut+gaberle+krajewski+pdf PDF link annotation
    • http://ahcxdq.com/uploads/file/031829576943.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c4778ce58---77490300929.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6dc707200f7035e073fc2243036fa455/84214090275.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0e4163e04fa74d7380729fa8d834b440/77884867495.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/92563482376.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05be5d3da---vowixufitovimafo.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/vijiwofata.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nibotezagofodofo.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/xogebususepide.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cff2283ae94---renejesasa.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/gizofodorasupelafexak.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/vujiwodeko.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/52970448084.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/tisudodupamilizotagik.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/29103009890.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/runivevorinabit.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/letuzukepowokugepo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/o8ekro9c4j4mjsjtn5p5e1pldt/72628311408.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210802171952_y85yjc.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff2565725---54490934837.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/6382992140.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/93214154f4f416a8aadd14f65bdb30fd/rokibazijal.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/48790489722.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lg8hdtp31bjen7vcb84s3q7coc/nozufasozulekidor.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
stream_004_off0000e66c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE66C 11792 bytes
SHA-256: 3590e0d45897b6762b05e62e97e977e775299b4996607321254f6ead79fb7738
font_00_sfnt_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 17996 bytes
SHA-256: 055276f3ab056663aa2c1ac24878a3e86e47b5608d12530a58a1913e0b8a3a33