Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d31d708bd9a9b3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 15:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 737ff24afa1029cef9fca674f12bf631 SHA-1: b08961c60aee862c7a1b8f042a5179be0d7fe9fa SHA-256: 86d31d708bd9a9b38f58507639d069a28328816637857fc1d343e1b6e915fbb4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xyoaa.org/sites/default/files/files/11399150173.pdf
    • http://agriturismoilnoceto.com/userfiles/files/zotisanozazetinanazoret.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a75a16ee56635b45f9e3c8264d026537/bagibodemosuwi.pdf
    • https://www.thaiahpa.com/flash/files/deganaboxutikumiga.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/rifoxilibigu.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f256504c---80839050039.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/ruxawejisotamavodabugi.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abdf98cfc---jisajisij.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613580c8e7d62---moxebodumetonomasifa.pdf
    • http://grimastone.ru/files/97026486794.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/durat.pdf
    • http://kmconlinecme.com/userfiles/file/76601265748.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/47n2pij8eogds3pa7nvkig9uhb/kitowurur.pdf
    • https://indiantiffin4me.com/nbloom/fckuploads/file/gepom.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130528924f7c---satutax.pdf
    • https://maggievanostrand.com/uploads/media/file/tojinekaxaluxagi.pdf
    • https://mehreganimaging.com/images/upload/files/61056278738.pdf
    • https://adikmanis.com/contents/files/wulujedodaxetanaxa.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abcbb35eb---kinubakisetu.pdf
    • https://epponline.com/mentorfinancial/page_images/file/27764543038.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=enagic+logo+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_off0000d015.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 16792 bytes
font_01_sfnt_off0000e827.bin
13a46665ca46bccc7e95253910715f395ad8bd6a653193544a9bd6c28cb9c5d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 18160 bytes
font_02_sfnt_off0001173e.bin
d19d1083fe549fee70d7bcc9d038e2994b4d6370aee511ca620963a91248ac5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 10280 bytes