Malicious PDF — malware analysis report

Static analysis result for SHA-256 82df6bbee0a9ba61…

MALICIOUS

PDF

75.5 KB Created: 2021-07-04 18:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ca29cf485e8bd37e0bf36ba5d9e032 SHA-1: 66a56dd01a542b43a07c2e626c587489155991cb SHA-256: 82df6bbee0a9ba6174448b833d72ed7ac4a8f96f965f034c6ebd0846c8ee085e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archerelectricsupply.com/userfiles/file/gipusivunoniduwowi.pdf
    • http://biirbeh.mn/images/content/file/livemusonumuvulesiza.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/edl61purtqv34plfgpvfqo74em/sikusagisobozixuvo.pdf
    • https://zzhqhi.com/d/files/sogusobuxogido.pdf
    • https://diaochue.vn/userfiles/file/kobomemiwinesafoj.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5824b1343ac0f79667a8c0b8e41f7188/goxixotem.pdf
    • http://growlink.biz/userfiles/file/40192661245.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af95d52e821---27999958295.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/gotipadonidefat.pdf
    • http://imhkayseri.com/resimler/files/jegopitifem.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071b69b2d87d---kowovog.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607606776cad6---wuzena.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9f3521e33d10e5cf7850e2a7cb157b16/wubamatasomorolu.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/63fl9dth127ad9nrsjq7cmra9i/11333653128.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ece5e84beb090ff76c9a13c64ffdb245/gebugapibuzudexofiniv.pdf
    • http://sequirk.ie/userfiles/file/zewaxunezukiwu.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc5aba2e2---lerakapofilenedug.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc30c53db4---11835462642.pdf
    • https://bettyloupaints.com/userfiles/files/92273586233.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072435895d7e---3340179753.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/70805dee0deb3713c9a058077464309c/bodagigevek.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6792df14d---zutuz.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160855ac5e7bd4---68476037195.pdf
    • http://nomaquito-travel.com/editor-images/gomonerav.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/h7escc7d9se0k73dlpaji1sb1t/bipubekagaxodivodubesanul.pdf
    • http://andlupa.com/userfiles/file/mufaruzevikemiranaruxis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=east+end+grill
    • 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_off0000c5ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 16792 bytes
font_01_sfnt_off0000de04.bin
d2882414651d59ab99f39df9f7c4fc2b00a3113546c3ff3a9c5079b6d707a09b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 10284 bytes
font_02_sfnt_off0000f501.bin
26f48eae8e1f27dc599db14d52e9db94813819b1807432911e643ae9ddd6f81e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 16816 bytes