Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e82635e0990f20…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 05:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca52d0144b6b60478f047deedeb7c92b SHA-1: 76c7d85a4bb152872a363e33c1164216ca5c583a SHA-256: 87e82635e0990f2009a138628500baf53879e787f40066e2096b7711ae877d74
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4f0bba57f66cf6ab964ad3668f00c228/68129614288.pdf In PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/mofitunirovux.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/60272608232.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/1342393298.pdfIn PDF document text
    • https://suksesunited.com/contents//files/28600098384.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/bapolasutegi.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/navoduxolasobimarenil.pdfIn PDF document text
    • http://unityproductions.com/upload/files/96154287664.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/paxuko.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/98273127402.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ecd109ed96951e370cea0c0198128ce/27958354088.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123739e6fd94---zitipajisubofetu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/pofamapi.pdfIn PDF document text
    • https://dintek.eu/uploads/file/52265430350.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/91529957059.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/39857238411.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tamurip.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/ramibijelevoga.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0bf2981a---49201019862.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/ramogixawadiwedagujup.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/47157118164.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/vuxulebomidewodizibatut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manfaat+jambu+mete+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 17020 bytes
SHA-256: 5fd1dca4aa5b7a3c1f9d683648b333ca9343c35bee8f9f65b77b1aed05be482b
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10496 bytes
SHA-256: 20c5a002e6e1a6db2596225c1538464cb8400bb57e7783e00f6ce646f99ea24e

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