Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1870ff93b4293f…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 20:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0eb83f20d7eb32a80faf433275850a64 SHA-1: 6e0aace11e386d616e10962f44768390fb702a68 SHA-256: ca1870ff93b4293fc30a260b6ed6d7c11af1b82d5fde975190ec6e4e8d1d5fe0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, specifically related to invoices or payments. It also contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect the user to malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://accesoriosalmayor.com/images/userfiles/file/sazogujimobozaze.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8gmv98tmqb784a1hotnmri65m4/gidiromag.pdf
    • http://geoplan.su/userfiles/file/masupobenaxelotaxunenika.pdf
    • https://alihuata.com/userfiles/file/72584890252.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/50917344284.pdf
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/44643595193.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/higmthlo1merseisggunl2bgls/lupewegegifeke.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a816489a5---tobiwuwisiforeb.pdf
    • https://tl-systems.hu/files/files/vedur.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be32f1ec1---8171071476.pdf
    • http://lungshingcentre.com/userfiles/85767961827.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/108904dc1dc2181e2b10cebcb4007b2b/birifirusuzogexipagexifoj.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1b4ffa795b586e56c825de6a85a8b459/vovuzojijotamaxax.pdf
    • https://annjulieskarpmo.com/userfiles/file/19873941234.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/dadijofosi.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/abeaa1975b2059d3af39c140c3558d64/20609937246.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f7b9670b---kofafifajilawuxifu.pdf
    • http://applexin.com/ttpsea/files/file/judokidafekunaleraberuvi.pdf
    • https://liniagdanskzydowo.pl/files/54835930055.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c184514217---lilijirodepubuxexigofi.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076150917749---68215747276.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef514c4fa3---vijekodexoxa.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5htpovfoh7el5ka06jgq3g36k2/78277493551.pdf
    • http://logo4you.dk/userfiles/file/bedizemu.pdf
    • http://kahounova.cz/userfiles/file/29913612.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=purchase+order+line+number
    • 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_off0000ecd1.bin
4db5e08a625248e4d3636752ddb0d348e91d6b294997fa08f830e06081c7bcba
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10776 bytes
font_01_sfnt_off00010561.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 16792 bytes
font_02_sfnt_off00011d73.bin
e1b1fee91437ff537982055a19c9d0e94581e6461f4af9f704c42ebb26c34069
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16836 bytes