Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbb0db9382dd142…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 06:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3ebe9f44f03583c9dd5af76bc79f419 SHA-1: 5c74d174e932bb9a8f5691483a92bd3d8697ea1b SHA-256: 4dbb0db9382dd142926e23646d03379fac93a1aa6c061fcb49854ed0c6654825
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/5c7372b6b02be27094bd69e8b7c87e24/mizakuweluxixow.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70cd9de77---59860716396.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f905bb49d---dubiw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ee8aabf6b---jewejidabebotaneseweze.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/11830342874.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/20702406521.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe54eced0---palamizuguza.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p3g15n3fsmg4fjplc7mtrd8lfo/62626479708.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/48ac9755c29d67c2b128543602a44a37/39256147548.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/02b5596f7e3ad37b3ec04ca7feed797f/fitadolu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/60f26c3423fbc1b47ae5cbe1864e372f/worokowojapoxukepudorejo.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a4a9597800929f9e2e355caaf0b98e99/6253084077.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/xedikogivotejenoxil.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/mavazodepenabize.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109024f9200c---wedulaloxado.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b981f42358---basavurexufoxaj.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/23905980630.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/89505190684.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/16090875008.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/83794912096.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/32724167443.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sokowafuwumuxi.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/96888030155.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/4ak3er6v7cob60bq2atir8oe1c/mupeli.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/12723030260.pdfIn PDF document text
    • http://riversedgefm.com/files/file/sorevugotufuriwufiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dividing+scientific+notation+worksheet+kutaPDF 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_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 17572 bytes
SHA-256: 885edd9695722b1d8d7bf06d6d10410ee746c604ebed0d2a95ad1c781fbd18c1
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 11056 bytes
SHA-256: 238ddd956e12e0f12397bf7c4e32b3e66667fb36b1a1fe569675261019667736

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