Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab44bb7555cc683…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 01:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9390951da0714755a244a73144b96ae9 SHA-1: 20d847568169b46e4a19972aa5355cdbb5712139 SHA-256: aab44bb7555cc6833b2026d0f73aebcce7bfd7264c634c7182fb3c671d7e241a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=wrong+turn+6+movie+online PDF link annotation
    • https://jackinthegymtpe.com/uploads/files/202109092248596869.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/68930350080.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/xadit.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/demotomizop.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/86060075840.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/86561097265.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/noxasowa.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/12322206474.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jjhimqjsapn2o4f6v54075pe5j/getenonuritojuxiseni.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/22529627625.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300323befd3---2084647788.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/tixutaruvabi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/najolugaduzoruvibejose.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/45771121556.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/xoxozex.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/5007324292.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/63305836938.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/46009494528.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9a9709658a9c7b7d1ff12450dfd295d6/kumixajane.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/28191597383.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/42141732657.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zidozatiduzika.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_off0000acf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 14644 bytes
SHA-256: 75c289bdaf5f1c0a50d89301c5c3abd2287608d4abb9e79fa1390a04d318e11c
font_02_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 10448 bytes
SHA-256: 51b198e9684065d0b02427c35c980fef627266787e188b5d3903b9437452aff2