Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e02f16641aacd9…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4579c2ac018c58e913239076fd18d418 SHA-1: fd3a33867dc078ea990f7b3e36c0a35e3d32d358 SHA-256: 39e02f16641aacd96c5fc3a7f09aff97a38f4bd04b0b3de1e25ec45fb5af9919
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1414b6be---65802177390.pdf
    • https://pmsp-me.com/userfiles/files/91489973189.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c48101807e4d502d663e1c3c376c0f9c/mafufukukoxibaxa.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a547aafd818d0d5bcc4a7da1a0617735/dapakovuge.pdf
    • http://www.pzkexie.com/up_files/file/zijepasaz.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gdao96rqh12q3m00k6gpqc6qj1/mumowopawevar.pdf
    • http://www.annaleehuber.com/content_files/file/zapatupejuwufazagos.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7acd366993---85221020110.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9718a01fa9---93537200027.pdf
    • http://rund.cz/UserFiles/File/bufujudefiw.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/89509843644.pdf
    • https://angkoronetour.com/userfiles/file/dofowewuvedona.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080af7a3fa07---dofenigawaf.pdf
    • http://alpinedelhi.com/userfiles/files/nafigapusotofawuviluw.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef1baaa6b---18431944484.pdf
    • http://tuzvedo.hu/elemek/file/43414750075.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53523e46b---43962050795.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73be83198---60120725623.pdf
    • http://zulassungsservice4you.de/bilder/file/33231194911.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=when+is+gacha+2+coming+out
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee04.bin
da09fff7aedfacaa92f5af17e15a75b0e0ca8ad2a38679c054e4403f5facb569
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 17040 bytes
font_01_sfnt_off00011a82.bin
b179b8e2a167083aedd4b41f34576b4d80318132946cbf0da215a56ba2592659
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 10744 bytes
font_02_sfnt_off00013329.bin
0ca7f33d6eab45fac5b8aaa06550378dc2ad130fe9aa33f2c93ac02ca5970b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 16324 bytes
font_03_sfnt_off0001497b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1497B 16792 bytes