Malicious PDF — malware analysis report

Static analysis result for SHA-256 d524ca5554e19578…

MALICIOUS

PDF

90.0 KB Created: 2021-07-25 15:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89a0afd4a8d458cf6666105596eb494a SHA-1: 63f7e422f497d14e2302228ac3e0217033a82d50 SHA-256: d524ca5554e19578692f91ee37efb5a5fdb8ae33d2c39ba78f735cb7ef86f354
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common lure for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a technique used to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9ced1d6c---37367297839.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd846ca6224---78492382368.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/89a6b27e514183bf4052d58de2463d1f/44945255477.pdf
    • https://victorybear-info.com/userfiles/files/lenosafugubi.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dab63345bee---ruzotutegiragowasaba.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/51974034081.pdf
    • https://stillwaiting.org/userfiles/file/81257877389.pdf
    • http://www.tekkoo.net/images/library/File/jomezakitosidipiwadi.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4602edc0d3ad76b060cd89fb674fbf3f/paremaberomajegejero.pdf
    • http://izeninfo.net/admin/upload/files/jilasotononijuzesurares.pdf
    • https://luminex.pl/upload/file/zuvarokalosobenakibigo.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091635dc1de2---xugosoxajisumuxawut.pdf
    • http://wernitznigg.at/files/penuvugaje.pdf
    • http://aliceinformaticasrl.com/user/pages/dorogipivimatijosofekax.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3f2bb80fa513bf9c28e25628150d1f84/65512607876.pdf
    • http://budoprojekt.eu/obrazy/file/rewikudipugudomilikuvo.pdf
    • https://techson-cctv.com/upload/file/59054585384.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b9d097090---89753343667.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4a47ae2edd695d3d9e15b235b052b1a3/80534690509.pdf
    • https://familienarbeit3plus.ch/userfiles/files/surusigaminalifevow.pdf
    • http://twothirdsmajority.us/clients/38522/File/duxene.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/36242492911.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6761ded3d---72991176568.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=roman+catholic+sotho+hymns+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_off0000f6f1.bin
45a9080b9d1470488ee1d4241e89948ef372bea898a09e05f96169e0ab4ccef3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 10812 bytes
font_01_sfnt_off00010fba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
font_02_sfnt_off000127cc.bin
21d86360408efba00d5ad17b0e811e5f294d76ee4bf73d426a84c062aad4edb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 18820 bytes