Malicious PDF — malware analysis report

Static analysis result for SHA-256 e873013255554875…

MALICIOUS

PDF

90.7 KB Created: 2021-07-01 15:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29afba6605bd14c99fbc289b69c0812e SHA-1: f7a65e516def17cbc0f0b0486598d18f2f7a61e9 SHA-256: e87301325555487542cbb1cb5e269612ad7e4d13263d86a0f2906c3f4d0e384f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://klimagra.pl/images/wysiwyg_img/file/42277420002.pdf
    • https://kartplast.com/resimler/files/96595697817.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084ae8f2a8---gelezusetaxisomudadi.pdf
    • http://humanitool.ru/userfiles/file/kawogebudazasebikem.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc1310343a---56373859422.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bedd88b23---vejuzosaz.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b23c6e20565e1c31c25699191b9afeb5/desalubuwefejanekawe.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607138bf49cf0---gozawiwinaburaduper.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81ff2c86f---82348583232.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6b21c175b0dd09bc2aad9ce12de7db22/16810441428.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b234205465b---48965075751.pdf
    • http://cyuanmei.com/userfiles/file/dofutonuxakaviravare.pdf
    • http://animalscipublisher.com/files/upfiles/file/wisireseful.pdf
    • http://stonebreaker.at/80507967725.pdf
    • http://desagresbrts.com/clients/34568/File/33631722610.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d65b5c05e90ce6db333854057f97642f/kanevorujovi.pdf
    • http://aimic.com/userfiles/file/63845091047.pdf
    • http://msslink.ru/userfiles/files/diwajuzuzejesom.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/43416721417.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bf1f819c26d12bec027869ed2abf4d10/vadovedojatanaz.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3e246567---43037716782.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/287e95cb40ade06a82f83b83baf1baa1/85459558847.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f0af48d2748b5ac768a7c879c59f4601/33650171124.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b209f1680---78083642468.pdf
    • https://fulzugaskozpont.hu/files/jegefufixajodapukil.pdf
    • https://vibangthuaphatlai.net/uploads/files/87631394519.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=horngren%27s+accounting+volume+1+tenth+canadian+edition+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafc.bin
1c7487b897f4e0790664024c45a7c4129e6fb4b237414c84e3644dac5fde4a15
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 18044 bytes
font_01_sfnt_off00012aa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 16792 bytes
font_02_sfnt_off000142be.bin
bf21a7ec61704accee31ddf35fa445e6edc39290e8617436bdb07b55cc965bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x142BE 11308 bytes