Malicious PDF — malware analysis report

Static analysis result for SHA-256 144f09b28d9f1a41…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 07:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 277f03391c3e03fb70644854bb063bd0 SHA-1: e475f48200c3da70c67553de8a689f09b9bf63b5 SHA-256: 144f09b28d9f1a41a85dd70449117efc938f603049b74d7072d3dd4d9181eba0
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://rld-carbon.ru/file/49929112603.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6h10pdq26a7b3mcirkik4vog3/58317660622.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/desipuxodizedodetot.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/neu2kfpl3qbd6mfs34ce64meu8/19780662661.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612801e010f1f---pokifafepofibavepebe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494955d365---sejawej.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/58265987771.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/48195360892.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///98516106186.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021625171911.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/r3cgb80andlm2hv4jnm51afm99/madaladuk.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611774bebea11---suludupixitufatat.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/jemidibolen.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5e8760a14850bcdba9c6f9e3e21d00ee/15210005504.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/13301304011.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/nibumakulu.pdfIn PDF document text
    • http://quetthe.com/upload/files/57572771405.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/71106521959.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2adaf136a---7607472728.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021082901202974.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/47365357346.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/18091646796.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/15720438754.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/jadilipirijolobuzopejebo.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/44805596647.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48arb2up9slil19f5ilh8kvv34/22933758812.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/jumebeneviv.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132d438ee2d---33779522104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=shell+script+with+if+else+conditionPDF 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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 19500 bytes
SHA-256: 9e93af5f51c85b5bb06853ac5b874244947b4bfb688e7b787d8be34cf986f562
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10716 bytes
SHA-256: ef8148b1050445c1bc9a31733be7e9e756869cded76363fcba01b5f901ef1e38
font_02_sfnt_off000129d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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