Malicious PDF — malware analysis report

Static analysis result for SHA-256 e037d5d55fcc38e8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-10 08:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5a48c018aad8f5c5a88d0962f907e95 SHA-1: 216f877c8e9fe2539a3d53fec616f8288b81b0f6 SHA-256: e037d5d55fcc38e82019142d410267b73ded849a1fc63394212aca852bca5253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other potentially disposable hosting. These links likely lead to phishing pages or malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://studiovalecchi.it/userfiles/files/sikufinafebojejelel.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oc67krh6drlj852pob1k37j856/14767448174.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/wefibanumetibinewafobavuj.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/duzufaruxabifeseti.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/48892225196.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/04eb7634f86596879daee745cc6334ba/xotufiso.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/941612171.pdfIn PDF document text
    • http://darec.sk/files/files/kekewakez.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/53239998007.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/sategaxitege.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131701190faf---97170805924.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/bewipifutivavibaduvado.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380db7cadc8---xitadilidizugu.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///velikajegirudi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310569d26df---62969230809.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/petufavagivudexederim.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/vorakuz.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/dotazalaforefadamiba.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/35637374037.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/97902842491.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326cb84c273---96269081652.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/gofitava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+loud+house+watch+onlinePDF 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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16560 bytes
SHA-256: 1e3b40ada7578dcc0acd5315f9ee003b037448575ebd5f2a6cfae8eb3282aaa6
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 10516 bytes
SHA-256: 72358be45b134364ed85194f82549e069a83c691fc58827aaf8389b163e1f449

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