Malicious PDF — malware analysis report

Static analysis result for SHA-256 20badd1a63264457…

MALICIOUS

PDF

76.9 KB Created: 2021-06-20 22:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 46ba51f1570159770b97316fdcba04b9 SHA-1: 4a7e7eaaec9157c2b1d80a8264a55a614606ec6a SHA-256: 20badd1a63264457716db09d2e43663b3c1ffbf76497d9156ff474a0d092494c
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for malicious content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/00ace77c2600ba6cd654837f91223cf1/doxazobetusisarix.pdf In PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/upavqqam1t91lstr2ucb7lcp75/gubomufiriloledo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6088a288db7e20adbd1317b9843201f1/somuxuxoloruzagabifupuseb.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3b2ddc63c11ef12b1ecc5e473c0c4a9b/raxixovusaxomusupevimagu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe422242c---radezi.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/329p3kvk9g7ij5fuoh9agiv3io/11594464303.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/10053325820.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b681ead1a5---134714974.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/2937028243.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cbae15fe063e6637434f1b3d6868f0eb/migixesevelop.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/94398388788.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/66c08a6b6a2ccd34fde970b264b3355d/favimubo.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/tinuru.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/89885408859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=avena+sativa+q+materia+medicaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 4904 bytes
SHA-256: cd2f09e2ad89e629b9cb2b338e2f325e9f197da3bb5eb30dc9bd842eea9ee1f0
font_01_sfnt_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 12472 bytes
SHA-256: c2cfb080c755bc130ef5b106a2984e7dca711443e92aace5fb5c5021b9e42689
font_02_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333