Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d49a3e719b151c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 22:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cb016a7d924d5d47ec46461a05ae002 SHA-1: 147dda7dd436ca7f6ff4559cf1cbda84b807db2c SHA-256: 59d49a3e719b151c685591b0217732ef5081a91214ea76754bf06939f776bb0c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lesfeesdelhetre.fr/upload/files/sasoje.pdf
    • http://brandnewgoods.net/userfiles/file/3898228623.pdf
    • http://retco.ge/ckfinder/userfiles/files/lirexiravuxav.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/jalitopejitareta.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/194db885b9fe89713a4643ec9d9bee81/woboxirozuwopagubavumu.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5aatn0i9ioihf6ivj1eopjc6n0/18469575743.pdf
    • http://reicar.dk/userfiles/file/nodero.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdba73b47---32961747708.pdf
    • http://jl-vacuum.com/upload/files/fuforepovukabub.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/30b17abd82911398d8b1cdf584410e2f/48710875989.pdf
    • http://7166867.ru/ckfinder/userfiles/files/vikirewabekujujos.pdf
    • http://bellina.pl/userfiles/file/14486413689.pdf
    • http://sibinetweek.ru/userfiles/file/remofomububajerumugux.pdf
    • http://domusanna.it/userfiles/files/99164869134.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bl55gatekt6sltiltoi22c5k9d/jonagisujineworuzuve.pdf
    • http://vitaminyplus.eu/files/file/51050469276.pdf
    • https://ajur.rest/uploads/userfiles/file/2775348220.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7819af31ad77645843852d3a17c6b5ad/90254453850.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/924679da5808a9770e3cf41e04ccf1d0/lufosux.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a5dadf85---labozuwubivexefuw.pdf
    • http://kxnjl.com/userfiles/files/80621599203.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f44e296---sugetejuwelijuxe.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5f1e8807ff00adf324bf39a8d97f4f83/24524704343.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/23522383394.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e23b53fc2---kadevixugivatamilawabidaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spin+spin+coupling+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_off0000dd9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16792 bytes
font_01_sfnt_off0000f5b4.bin
a78b7e37c02de2c4a8c7f24a3dacc4a222737dd24a9e32151e5001527467f68f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10480 bytes
font_02_sfnt_off00010d48.bin
523cadc5aae18828af14aa6e1082117ad6dd0918c45132f25e82d41f2d1dfdff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 18400 bytes