Malicious PDF — malware analysis report

Static analysis result for SHA-256 940b20c86b0b7f4a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 01:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d6a1d1707631a82ce6f01bbb5491029 SHA-1: b109862cfef09412c7b36e38c4cacaff909b57da SHA-256: 940b20c86b0b7f4a9fe7bdd45ca574a01772019a8ee45226d2e26379665b59c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or appear to be compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=ez+star+injector PDF link annotation
    • http://hart-metale.pl/gimnazjum/userfiles/file/67989876774.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/87513957209.pdfIn PDF document text
    • http://mfahk.com/upload/files/fipiwaxiwurubetif.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/ligitifanokekejuzuwuvazer.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/84ada3ba65b82ef045e1ebd5ab57b30a/64026080240.pdfIn PDF document text
    • http://ave-france.com/pics/files/wuzibugasedugotu.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/28632176884.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/betumexufejiman.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/tafubafubifuguxuvom.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/91145680035.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/35948774329.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/27370201789.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/taredawijapobim.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/531a734fddadeeb61608947663f94a35/5346148303.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/66418621605.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jimuvurejodoxo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/31721318155.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/66612690035.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/78979119021.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613450ab86180---bujisowedugokukefupepabo.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/kefadorobitox.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb59321bed---57729766865.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/fodixuzu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/6376048303.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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 17316 bytes
SHA-256: 1c68acfad5ac35f6838a2c9835ec6d86dcae9a6549faedae7849aedc6c9cc1f1
font_02_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 10352 bytes
SHA-256: e195db9f8c693010ea57da6b5c5249a8d9f83fd1628ea42cd378fb9517450851

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