Malicious PDF — malware analysis report

Static analysis result for SHA-256 85786258e2aaaa7e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-18 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 959019945afe94e118fb524786dadc83 SHA-1: e93c766cd499afbebae7a78cad2565054a0d66dc SHA-256: 85786258e2aaaa7e757ae26697292f360015005326c6ced07bdf1c19c7fd2a45
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ruilong-ironwork.com/CKEdit/upload/files/9349215152.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae3e46258---37283072693.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3eeb29dc---43643643004.pdf
    • https://ekransamara.ru/files/bisokofofi.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o9aten1jhhsonp67d47vp0c2da/daranumuxuzi.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4b13c4e43e2189f18ffcc16ea0ff2b2e/xoxevusijowije.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/38101f7b869350d70f777228c2188505/86557104148.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/95660173386.pdf
    • http://eltonltd.ru/sites/default/files/uploads/8418512899.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/ritepowinimavozemoleboxaw.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c589d3b311e---36722639123.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rf9gmtuqt5b2jtblc3uj8q5s46/sedikuveduk.pdf
    • http://w-mill.jp/images/file/fekinefik.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f8554428820c6d0821418036158ef257/66846010508.pdf
    • https://almuhja.net/ckfinder/userfiles/files/83021260151.pdf
    • http://yogo110.com/userfiles/file/womajutibonajidurofizuwin.pdf
    • http://joyearland.com/ckfinder/userfiles/files/61021666082.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/33552349438af546a4b83b00925356da/fupofowelukulukaragaga.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/76872608673.pdf
    • http://osteriadelcampanile.com/userfiles/files/64252874718.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/duvubagojowojepolidixapud.pdf
    • https://topclassgardening.nl/images/file/36370613654.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4125dcaaa5---gogekametog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=numeros+complexos+exercicios+resolvidos+forma+trigonometrica+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_off0000db19.bin
96754834428aa5ed68f7fbdfed45d664a78a7aea389530a3993aeb9cc9751b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 19796 bytes
font_01_sfnt_off00010c69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16792 bytes
font_02_sfnt_off00012480.bin
fc9f7c718be5884479218f20797c2e780fdd1d9aa93c06c825ce5817098ed767
pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 11208 bytes