Malicious PDF — malware analysis report

Static analysis result for SHA-256 541bb777a3c03c79…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 19:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9235c2baf722e44f15e31ba4a9e02033 SHA-1: b0c83de7cad15e528cac610d8ea01ae222fd3e33 SHA-256: 541bb777a3c03c79fed246e4ee0981a108ead68b8719db4c30e5718be0716a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://heuresromantiques.com/upload/files/tuvunem.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7b79a262768da8046798f536eb0e15de/zubomepafedeli.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3afcc3a83833969f8abf591376d5abdd/63353971188.pdf
    • http://yuhenganquan.com/userfiles/file/20210705035529_1498799209.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b4aabf997d6e41b577f12ed5f2bae55c/wusigeme.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bea70c82a459f7a27995cf3f47c964b5/lizusidabilife.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fb2slnsb1pq69f6t2nipfouepv/68205239438.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d654e0251f94ab32620d716b572b1020/jejevegepufiz.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f88724144---55455830150.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb34a4b8b---31094218866.pdf
    • http://ersatzmonitor.de/userfiles/file/pulagodozomon.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/vurewur.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/zunirovokibojurorexamupan.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/21686aaddfda373265e7d40cb9032ac1/10216158986.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb5c7f099---6147654270.pdf
    • https://betalinktech.com/blmedia/file/ruwixidovotafo.pdf
    • http://illinoislivestock.org/userfiles/file/jufejiv.pdf
    • http://cokhixnktientien.com/Images_upload/files/10914393227.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f5317d31---dupumumemebo.pdf
    • https://aordonez.com/images/contenidos/files/nalaxoniwusazasunozozag.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tv5sa6j3at96a5mbl15u8ks0t1/43226736178.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0cdacdbd---xitamebezen.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094323cb53f2---18658339194.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=damon+from+holmes+inspection
    • 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_off0000ec52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 16792 bytes
font_01_sfnt_off00010469.bin
d1d2b55d02d61233b3b3bc4f0a99ce4f4be6f82cdfc2ca1a45e14052c4978b12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10744 bytes
font_02_sfnt_off00011cde.bin
9e37761a47ca72314ff6e9af09edd12ac9747835fb557e80d6e13fd9555cbf30
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 17664 bytes