Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21d395b1b55bc03…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ccd91606e5bd2e9cd3fdab16cfff535 SHA-1: 1038a5a3eaa28b8eb5e8309a3ed18c01cbae6490 SHA-256: d21d395b1b55bc038f77087318180ac8124d8c9c5557c9c2a4cb6b3b5e4748df
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs, including those hosted on what appear to be compromised WordPress sites, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=what+does+suffix+mean+in+a+name PDF link annotation
    • http://allgeology.ru/ckfinder/userfiles/files/61250520600.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/74871663260.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/lelevekukegefavevota.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/jobobuvokebakosibesuzuxam.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/vawarutozaki.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zezowenivo.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/34654654342.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/71157435820.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jowurijebofekila.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b2d4e6ba83ad3195837b3de33df1d20a/zogosiravomep.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/sipuwujizesemodo.pdfIn PDF document text
    • http://393citizen.com/upload/files/rofozubemav.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/2682509505.pdfIn PDF document text
    • http://hkwwta.org/userfiles/boburozegugabil.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/51183943893.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xufewogi.pdfIn PDF document text
    • https://phr4u.com/files/98333905160.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136530c1a35d---zinupowi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rupajesunenikibowite.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2b33018a---6933702754.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/jogajipemi.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zosigilamevewarapibubupi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136db3a2c25e---58872585598.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5985dec5d---29694687350.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/pisoxowarabapuzafujititif.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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10668 bytes
SHA-256: c8f2597ae032a28621924606b64116c3ba7dfbf4b80d02484ce5e7f242ba21de
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 18940 bytes
SHA-256: 2685debeb441623cf6b435c6c5d64ec9cec5396aefc8e7813893bb180989f93b

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