Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea66ba06844815e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 09:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d43e08b29de97064a7a3ddc8a863979e SHA-1: d6852d7fc4b218c6a0e784abcd43bd7b6c6e6d42 SHA-256: 1ea66ba06844815e26f6326aa81253c9bbcb1711c5ce439a4e3ecb6242fbd741
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bkm-market.net/userfiles/file/87973559706.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0403f364aeec219c27848fbc9d5ab0c5/nekafiburusupogepemek.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1efa3871---lugowu.pdf
    • http://eclickapps.in/userfiles/files/kojelezositobi.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/84d4htnn1eshke44gqjus0u2u6/fananakabe.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137affd6a146---79703144127.pdf
    • https://ratodua.com/contents/files/19997733129.pdf
    • http://campingwithconvenience.com/files/files/75952371127.pdf
    • http://usatovl.ru/upload/fckeditorfile/67307775132.pdf
    • http://letnipohar.cz/upload/file/duxomegugagoji.pdf
    • https://shian-jin.com/UserFiles/files/fotozarenowawefiwoguso.pdf
    • http://thaiboxes.com/piceditor/file/darotudoxevemotumitejem.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/nalunuludi.pdf
    • http://shinex-auto.com/userfiles/file/weduribadexipexug.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pofegakejobakewurajapa.pdf
    • http://clinical-pain.com/pds/userfiles/files/41687928513.pdf
    • http://jdjcnc.com/upfolder/e/files/20210903230845.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/podorupe.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5597ce8ff---rebaxadu.pdf
    • http://kitpaisal.com/mypicture/file/raroba.pdf
    • http://skrabl.pl/www/rpbd/fck/file/movimolobot.pdf
    • https://cowik.pl/upload/pikupovunaxavu.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/simuw.pdf
    • http://ch-yang.com/upload/files/6815694216.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=table+comparing+prokaryotic+and+eukaryotic+cells
    • 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_off0000c6ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 16792 bytes
font_01_sfnt_off0000deff.bin
f651c0dba033125486fb09d695a885d9f3b67a9a3b4eac92af894c0dcc605c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 16992 bytes
font_02_sfnt_off00010a03.bin
e5caade7f4022e215a2062493d8ad87741ccbf622b7c370eb4aa1422d088e748
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 11264 bytes