Malicious PDF — malware analysis report

Static analysis result for SHA-256 998f4cd2f2b5b686…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 05:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 943fd4a4c21c7663ec533467a2f062bb SHA-1: abf3505ae38525cb7a5f9d7f48653db093d91729 SHA-256: 998f4cd2f2b5b686f3fb97ed92df4055ae4a55308873254c869c35a549510913
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised domains suggests an attempt to distribute malicious content through a network of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/irhvb492l7rauqmuud12i359q3/xawepubevitisodemiv.pdf
    • https://plasy.com/uploads/file/51520737277.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8826890541---daveduxefaro.pdf
    • https://golf-tout-terrain.com/publish/page/file/turute.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210624_7E7F4E46220F2F0B.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ue6p0b8ebocsri3qsmoovmq250/56744057464.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93165c65e---nomilekibiful.pdf
    • https://turkuazhost.com/calisma2/files/uploads/51575738318.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5d0a9215---zovefefivotepajamevi.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/738d757460eeb7f3891855990ae8a736/xotegoxiresejuledopuxina.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/16620191622c11abfc365f561ce0ab8e/38116106896.pdf
    • http://kulturazebrak.cz/userfiles/53621878804.pdf
    • http://akkoryazilim.com/userfiles/file/60391509116.pdf
    • http://artecgroupservices.com/imagenes/file/dorubotudutotaz.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1fc44ab6d816484ff874c1bc252a8fcf/vakosekepoj.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/409c0c2fc6de32fbb1ad0fff0d0d11a7/poriponoxatedide.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/kejojexanavewibarog.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/73161647542.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5ldebjj6bfpl9lqe544mpc4u1j/buzedefotekegujopif.pdf
    • http://jyjwqj.com/uploadfile/file///2021052623591140.pdf
    • http://ccswcd.com/userfiles/file/66338205528.pdf
    • https://allmassage.net/upload/file/20210507051829.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lab+chow+mix+life+expectancy
    • 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_off0000eebc.bin
a1b87846c91cf96276d4163edba0d2565123653cbedf9d371e5539e8e954346c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 10876 bytes
font_01_sfnt_off0001078b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
font_02_sfnt_off00011f9d.bin
5773e28beb6f246631711eef13e7692753a5728d9cbf6ba37959ee5f9d4febce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16236 bytes