Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb38a70623357b9…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 03:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be377e67416a85f195781eb82b43e4d SHA-1: 8053d33e8f044e628639e31f0120db86903e42e9 SHA-256: ceb38a70623357b90b18a1abdb95c3853a43d5898561daf7ef307b75037945f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of disposable hosting reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/b3b87eb5316c6abd32aa333a37bbaf15/6654080253.pdf
    • https://lionkingbali.com/uploads/file/74246574461.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a467ecda46f---37481238710.pdf
    • http://podiummoda.ru/userfiles/file/50655171401.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c7840d600---popozuzatogibiwo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc537fc0---zarikikirutobavetoduro.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b5c7a42952dd25eae26b51cd996120e3/sonapo.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8024ca1affcfa7ad2f5e4fed1426e803/35048379678.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5d2ac15c---zatamovukonuvilemu.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a1753d26---vowefewanamubib.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec78978486---kabonafega.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/mizuxor.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/avs86uj0bm56k81hha2dckka2a/25727710606.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/35748a01424c14a22cdc98b4b3709e18/15272953715.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0cc242da69cf9b905ceb2e78b6ddc813/30254549834.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3fuakf0bths6o7lj6ia2m3o232/17114337306.pdf
    • http://duancanhotot.com/upload/files/xoditipidebi.pdf
    • https://art4you.sk/editor_uploads/system/files/13866183828.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8ae5b5f64e1deaac27c5480c33b0a37b/xikirujubomowerub.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6636da80---bejosen.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ed2897b0---detugezegikegexodeke.pdf
    • https://dukra.sk/editor_uploads/files/zulalapukukojibif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=classification+of+oxides
    • 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_off0000e932.bin
0bf27311ac0f1319c7cbae2a6ef2dc9b78cd5c2613f1254f33bd484eae6f2f36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 10500 bytes
font_01_sfnt_off00010141.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16792 bytes
font_02_sfnt_off00011953.bin
69e5256fa6742e8519eb352692cce648fcc1d0ddcc60a3610902c45bc41a0fae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 17736 bytes