Malicious PDF — malware analysis report

Static analysis result for SHA-256 8077ea4087336000…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 17:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cdbe9a2d06c4968c78ebda7864e5314 SHA-1: b2e4d64e7eee3bc8b32c748919abd27d0d0b90a8 SHA-256: 8077ea40873360003fc7f26003cd4c05f0d695d55e6e1eea9cd5af9e569d2ce7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trungtinjsc.vn/upload/FCK/file/96594046295.pdf
    • https://vvpta-irvine.org/userfiles/file/43653325532.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b83680157a4---63247971921.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca9a3fd34---wesuzonajakajupetanika.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1hm3u7pbd4traiekkdccuv77er/95189309731.pdf
    • https://bioesteticaonline.it/file/zidebomelid.pdf
    • http://samnakthodrahassob.com/userfiles/file/nolijuviwo.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/df90371ca6306c38557ea6571721ae0f/vodisakawi.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58c45ce0d3---23002271074.pdf
    • http://mgtofubbq.com/uploads/files/suvibexejikumapulawujexut.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/dofoluremumix.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1611f54787f588---vagoxinafaxaze.pdf
    • https://printjet.pl/pliki_user/File/83199069467.pdf
    • http://chanhbon.vn/media/ftp/file/47691043903.pdf
    • http://www.colormotion.cz/UserFiles/file/bakapizonajifa.pdf
    • https://zibarajabi.com/cache/fck_files/file/75142064764.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/b3141e7822c84f369d1f517dbd8be308/gajab.pdf
    • https://msvadba.ru/files/file/bogidipesowowikarewapuveb.pdf
    • http://twtime.com/uploads/files/202108171727526685.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7056c6ef5e---42863177401.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612811658e9cc---xudupuponakuf.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p5qb0ip4diolj74cofisarhsqm/jobujelirusarepej.pdf
    • http://ngocvietbungalow.com/upload/files/93121758786.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=planner+2018+para+imprimir+pdf+gratis
    • 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_off0000e7c8.bin
8706aea62db965012be5cdba2e2c107a6a8b1e4476ad86bbc85dd3d93abc50ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 18892 bytes
font_01_sfnt_off0001192d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes
font_02_sfnt_off00013144.bin
f69a34ffb871b9189767fd7fb4e56a3bce111e3642f797b13db400641d29f19e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 11224 bytes