Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99ac0d8826a0b2c…

MALICIOUS

PDF

84.4 KB Created: 2021-07-20 15:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74eb61bb0b759bfe6b6db909ce4923b9 SHA-1: f7dc3f7b6158a0023babf2c303ccab28f43fcab0 SHA-256: a99ac0d8826a0b2c3c57f43886a9e7d93f8f548cfa8afef368352eceb41a2eb6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or deliver further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific exploitation vectors beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://imaginove.eu/data/Files/lurumivowegufowakajo.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9ded4865---zaluxekiwezewen.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160acc150e4a52---xurin.pdfIn PDF document text
    • http://sns.hu/_user/file/3554338768.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/57017802287.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///ligajezavibedawiboxufulu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/22132192693.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210627040809.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7ca524d3---lujebupizesurulebewadevaj.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac0eafc15---disitefo.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/maxewetev.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fae339fa4---29069219812.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/976afbe88c337cce0b76c29810a9fe84/xawugojikafusubixalubojo.pdfIn PDF document text
    • http://debden.org/userfiles/file/jekudalenipojo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/51472579246.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/sutotokewiku.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/21019126937.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/93722526350.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/rawurulurugowogokimam.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/63f2e42f37483e170cd91ccda78a0404/pabedonin.pdfIn PDF document text
    • http://banquat.com/userfiles/files/wupimajosogi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a8723994fdf8c9d75eefad2883d9574a/vigivizeronosexuwosid.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb6870b1f---sezuzagewutimuxo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1acd0ce43cfb670bbc997bc49c24ec88/88063232336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+were+castles+built+in+the+middle+agesPDF 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 11136 bytes
SHA-256: d089b5f461c3a111bdee2adfde5971ed292936f2f2cec07c159aeb89f6395c65
font_01_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 17056 bytes
SHA-256: 4f3a17bc2157f23fab13f03125a3b35436c0f16683df83bf54c8f4b8121b0143
font_02_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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