Malicious PDF — malware analysis report

Static analysis result for SHA-256 13eacdf473bf971a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 11:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a08ed84d8b4cdc962025ea37f77d973 SHA-1: bbf4cf6efb2aea41780e1793d4910a41eb10c9d0 SHA-256: 13eacdf473bf971aeda29415134275071ce0bc46b283795d90bcf6f342a81421
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://snailgame.ru/upload/files/20210901215556.pdf In PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/mufenonusototubeginowab.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613264b087cf6---funekowobuwowevusopuw.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/laditovase.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dd68f724---27705879109.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/59588583705.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/rafopidopiwefewowiru.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac42b84c3c---duxifaxavatumunase.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/datadaw.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/levutanekiwaborizexo.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/33308167645.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a72dc2876707cf4a2ad09f115a6d955f/wimuxu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d275113b96f1255aef61c94757407f35/woxevudawulomodifisa.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/vujebuzonirewala.pdfIn PDF document text
    • http://classtool.info/upload/files/nedolerarelejelinowutaxew.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905081109219908.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/sixatobokeko.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210903122122.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/77730405643.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9358d0446---vajapomanutuxozefanow.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/gesemamumezopafewikow.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/tagixukiviziwavojabunam.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dilebiberoremoxujadupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=deluge+rpg+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 18764 bytes
SHA-256: befd2b93ee1b2970608b4ffa1b82bb299a9ebf7d548288bba5c75901fae7b727
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10036 bytes
SHA-256: a68a4396f2ca7c0e8bdaf42356e677708114c9f8647cb281d9e137a2fe70d057

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