Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f4dd916c363779…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 05:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9641bfb5f1fbed9d0bb1012072e6bb99 SHA-1: 38a4b5963fd1681e92198e6c093f7a5532a3a5ec SHA-256: c1f4dd916c36377943eef7358d75842767371fc080311f853734b9b7ba17caeb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm or hosted on compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=como+baixar+the+sims+2+para+android PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/88252641042.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/60608249404.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/84340941698.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/fajiribagitusaje.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/gudedarabix.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/sutukiridaporutugilifi.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/sowogoxajezowapa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7409cc8f---zijesizalef.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/8127041573.pdfIn PDF document text
    • https://onlinendttraining.net/files/56537417387.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_2CBB9545DE4E6C2E.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lirapujepevalotegoxugoj.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/jekijejusagujom.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/76572341603.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/6486929803.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/70469584622.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d24c2e7c3482d175c5b508fb3d5264e/33336282019.pdfIn PDF document text
    • http://linker-apps.com/files/44939795144.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5762a441---rexukitokonogowiziz.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161338e34f1a33---50377523728.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/66102553148.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/87775874500.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/e0cdaf99a49369a9727895ed60134cbc/35269719503.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210901210154.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sekuwag.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9a08e05bed6633300b1626974e54f539/49573313149.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/40277260216.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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 18176 bytes
SHA-256: 454fe8ce741f6ccb7c304e9c83a5c6e47ba6359bf7e180d09f82f0cdda4a7665
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 11004 bytes
SHA-256: 4c6abdf957d53a63febb4c18a16677bcf6d8cf7cf68c06df847c93a4fb75e9fe
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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