Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11e3831fbc33819…

MALICIOUS

PDF

67.3 KB Created: 2021-05-26 11:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a9f22d56fc0eafc1f274899221b25b SHA-1: e1a3734e50604c5486fcc1f390784d7de986b58e SHA-256: e11e3831fbc33819c77ca962ff05493ae76528ee545e80871009f1cff342f793
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to creating behavior charts, which is a common tactic to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b46f865accfe9c3a7fe3904d1d4d9b9e/vuvikelomif.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a6771873---naneronomoxijojiliran.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a0n7cfv0bosc729m80rs5damhh/71335842146.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86f653610---96308479478.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32bb7fe90---66754257484.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087976bf348a---lunuwobatosolazap.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/bo1orip6bidnaus6pjgqodu7o6/91457263213.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609707cbcc9b6---43462453245.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf679e27dc---61274229396.pdf
    • http://mytmbc.org/fckimage/file/bemufaki.pdf
    • https://alamansyria.com/userfiles/file/turug.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5c5890626cd9ed74c8989d6e9896aa42/jujut.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/rpqrmu9tf4toq4uh3iud12mfu9/2693858129.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qhg2dipc6n2o0mnq46kq7he0gt/94955354024.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+create+a+behavior+chart
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccdf.bin
b5408c166af625de0c2e2a518c1895806d54f910e82ed54576eb71a921b7b53b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 4928 bytes
font_01_sfnt_off0000ddb5.bin
5d82c745714036253c3153248b74196d8d0882d67b6a745672cd0f05ba5fabad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 9732 bytes

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