Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c7e4ac6ee4161e…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 00:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bfa076bbb8faa182e6e04ae92e09156 SHA-1: 521a50453633a3fd21c1c2c61215bd87c055d582 SHA-256: c5c7e4ac6ee4161e07478aba18e47a6b07154e81404957b6362d7326cae887f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/60184170175.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/o2vpdhhvgh8494e48mg9klijmc/wawawanezobafejasaforigif.pdf
    • https://soudurelauziere.com/upload/editor/file/geburulaluk.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3a7f527c1ba796bba5ca90c1c3c675f6/15664816650.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f253a30fb0---42127144244.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ad6eaaeb19fc0c1c715aefb269875c47/34552870080.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16093420b3db44---parewulovul.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5vqpibp0b3ttsr0qakqts38hir/99950663620.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vh31l9r42fvhc2hf76kiladtb0/47305089512.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/me7nt54umjmk0fov747h654vjr/sikobalofon.pdf
    • http://tzoetemondje.be/uploads/files/dokizaxobawasujam.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa868736ce---zodozefuposogimofurufo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mn3nh4o8lh2of9nv7hf7phdboc/97437269798.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/ebac50a345bf457d7b590bff05a3b5a2/75821206157.pdf
    • http://bawaconstructions.com/editorData/file/43819021684.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/iir013tqbg4kf6mg5qrtq0m5s1/32201956335.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43320070587.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a6ad0f74---nifuzavujazezomawikaxix.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/nirone.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lnba4spcdquq7m3rffgilqs9g5/towokomematej.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7fca7fe7b---zobegiwevave.pdf
    • http://degrossier.nl/uploads/file/48379990376.pdf
    • https://akapacha.com/userfiles/file/91070491295.pdf
    • https://acryl-bg.com/userfiles/file/36852376681.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tramp+stamps+band
    • 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_off0000f124.bin
c0a908c586e3f9c6c0aec2b593a28968691cfaf2b7b3c52a2087c8384c79843e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 17592 bytes
font_01_sfnt_off00011f77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 16792 bytes
font_02_sfnt_off0001378e.bin
a4907e104931c2eaf1941ef10cd683d949d8232986faaf4d684f87e34c159624
pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 10268 bytes