Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bac189cc1dabb0e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 14:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35c6013c10265c3927a3f49e652c5e3e SHA-1: b81b19ba19cf3995d65a9772551c806ecc722980 SHA-256: 2bac189cc1dabb0e07dcec8b81ff1e875f45d612777e4301b772d89d5774e27a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful external sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=esl+simple+past+tense+worksheets PDF link annotation
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/9f6fb0211c254c6fa8703ffdc703741e/jugezumure.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/amvh609j5gdrpihbme1kb10ror/pazitaxisodebeguzeru.pdfIn PDF document text
    • https://davaocarrental.com/images/file/jafufetisifanub.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/aifakkv53dnfi43tm9mfl3ge28/majezinuwodusakedumi.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/80531634263.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/degefuxezasiwukupo.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/koropisosukakaropa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0845f6b1eca45a4030a77cd7c096f659/77543629070.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/88055727872.pdfIn PDF document text
    • http://boki.hu/editor_up/bezokiwuvat.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f1c40e433a63fd8ef62b84782fec5f32/81136677419.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/815a5d07c20f459721c293f6f99f600f/mofewew.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/39400871044.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/46944279073.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/28700375324.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3df6d3a28ffe4356d1a441e7d4399a95/47210798387.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/93239669577.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/47467509461.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5e995d4249ff116ce5d605376079028e/93121742234.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/49146748125.pdfIn PDF document text
    • http://honda-vo.com/upload/file/baxomaf.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/24499503470.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8dlpftl3h073shs08fl2bmq3f2/58360087537.pdfIn PDF document text
    • 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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 17516 bytes
SHA-256: f29e69c110809e6be239a04e49d9ab009cbfd7d12ca6bc67ba5e169e3a10a8d2
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10676 bytes
SHA-256: 2ef05b5b9381e2c550d38df1c2d7cda0e70573fdd61b2929aa14bc45e8096000

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