Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda0b97dccfee8b0…

MALICIOUS

PDF

91.8 KB Created: 2021-06-06 19:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81cf09ebe38cda2ccad96c76a062505c SHA-1: 98ee262d3ef5f2c61a1ec3204df0fcd9ef9e6a38 SHA-256: dda0b97dccfee8b041f440de00cfa2d9584af1b330a87cd90f77785c567e5732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=spirit+animals+rise+and+fall+book+6+summary
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3a86155913f0b6efa1588a5330630e46/defelafobofuluvukubu.pdf
    • http://ahlhy.com/uploads/file/300635434803.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607798f36d354---99337508105.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/nufosaluw.pdf
    • https://brod-plovdiv.com/images/fowutaledejidanuvesovak.pdf
    • http://c2ctrading.org/cms_upload/files/sifavoriduri.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/1008189582.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fb505954a79023a74e2d4d3dc0bf4a2e/5703750870.pdf
    • http://aarogyamedico.com/userfiles/file/69917307857.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc83b3409f---70615313751.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/8a7e37b985119cd995a2e632e54d63b2/27815584295.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077adb3ec07f---56959589418.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9798dff4b---sivosebizomobaxegezu.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0ead5e033---gezoniwagomarune.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a43928106053cc9690589e234dac2cde/86911129360.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210531/file/16224570204811.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fad9a0830---15409544901.pdf
    • http://softwarefactory.nl/images/file/20639623216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012866.bin
6efe71d904c7808a89f0fcd02efa323eb915406b8d49a9fa3ca172af396c236a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 5752 bytes
font_01_sfnt_off00013beb.bin
29f90be90e148c4986df2e85ce4b7453a162aec625d2b4713f87bf84b7da58de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 11200 bytes

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