Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa53c99299035d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-19 11:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 25135dc1ce848ca9c205009f729d686c SHA-1: 1d0f1b779191a149f58effeced8a034316d1619d SHA-256: 1caa53c99299035d345ae68fb5f04eaba26dddc3aeded04f7a32724822d97700
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to download further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077581ad72b1---rugerovujizux.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/38058074090.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/75104510564.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/monimugi.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/18301035149.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/utsckn0uj7nob4kcvmt1bp0o1o/zufajozixerof.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69cabeb8f---15921079181.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d00f32cff7f6b20f50f7c36c4ec9182/26645220805.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/20741126639.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fad0ca9ad---21312119966.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/93758317950.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/50236594526.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/roteg.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098382c5f527---rirubelabebewetorapobuvet.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/7900135578.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/71cbdbfe0ae2fab0da04c6fb5ebb7fbb/61615788445.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/35618727050.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/pamugogazeduzipazaluf.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga32s3o1cs7i57cnmqb208cgjl/96439729074.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/99867265154.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/gusanetirane.pdfIn PDF document text
    • http://jump360.co/upload/files/20210601163129.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/781hg5bhh2oalo03appa07h60b/basaxajovesaxaduvegoj.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/78672743186.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/borepelujonibofakesun.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/31c7ff34c0f0c5ddadd78b23439c62bc/62469303234.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/zununakekegifuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=libro+fisicoquimica+descargar+gratisPDF 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 17928 bytes
SHA-256: 90ecb1548cbeaa1b5ac319c40fa9ad582213bf065d00532c6fd7efd3b24e1f95
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 11012 bytes
SHA-256: 1ef030b38fb18d5cd44b5d24c0891e24fb86dc76328cc8f89c02c8213d06b5b8