Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2e2980c32436ab…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 12:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3b964018a209bf7ac0baf44711d2bb7 SHA-1: bc5ad3b481edafc35c3fa9bede17d92c284ebeff SHA-256: 5b2e2980c32436abd8e6cd73f659d2202aae1d396c6d5366d14a310d3dae84a6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The primary purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=hsi+color+model+pdf
    • https://www.thaiahpa.com/flash/files/97863192867.pdf
    • https://people11people.gr/uploads/File/82661433975.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ab1ae68b89a681771b1c406fb0bc12d4/xatalek.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb62622963---terojevakeliwifemanal.pdf
    • http://hanyangsteel.com/files/fckeditor/file/121955647361208b85d775f.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/zukudinewinotonumofavuwuv.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lufagkc0tdvnhn4f0cj53su2k0/ruvudojukodatirovukos.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161046547ace13---20177205007.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161039566a0601---taxifaxefetawumof.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098d2f0aa77c---19961571683.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/12022763701.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831f3c7dffb---buberabikuri.pdf
    • https://kaowei.tw/image/files/20210812_113612.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1236a86ee7358da211da88b62a397a7c/74598329747.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8aa767730---jamikogifekipikataji.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f63a42f02223d0430768023209c973a8/xufesubojumopoledi.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963b3fe4846---93173078114.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/de5ed92e594afb5bf3ee64ad5fcfaf1d/54608874981.pdf
    • http://autoachtercamper.nl/userfiles/file/jirubiwilowe.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3875135131af699301b67755f2a367bd/kixukab.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd11f9809c---jujavimovazov.pdf
    • http://akcjonariusz.com/UserFiles/file/nufivefokuwufi.pdf
    • http://fxmeat.com/upload/file/b3d75374b000626cba5032e4c3365866.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/527534e8425f2416eb8955ba6e244959/wawewebokikilulomejan.pdf
    • https://ms01bet.net/contents//files/kutovukigomulo.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_off0000c485.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 16792 bytes
font_01_sfnt_off0000dc97.bin
4f48d150448fc90c0c99012dff3dfa02d029d758fbbfbcc8d2fbac2a4486e7b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 16160 bytes
font_02_sfnt_off00010674.bin
edd893dd80e893ff5dc924d6380296cef7b39bc56e75b82a349b341e2938e677
pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 10408 bytes