Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc75f631698a9c4…

MALICIOUS

PDF

78.0 KB Created: 2021-08-03 09:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12e0fbf2ea0c6b7a0906b74739a373c3 SHA-1: 977b9f307be29b6db64faba506ac1f072326a715 SHA-256: 6dc75f631698a9c4f9dfadb1eb92e387a75715c5ed58bada989339da7a0c06c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of link farms and compromised hosting often facilitates the delivery of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b826d748b65---jiberifudatopabowit.pdf In PDF document text
    • http://eros-arena.de/eros/userfiles/file/midekanowefesifesuse.pdfIn PDF document text
    • http://kasargod.net/uploads/file/49305159688.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/jitagavi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pokavoxode.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c3c6c7bc---gukodorekakodex.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/162217452043.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/61837350743.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/32169652987.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/zifomalukibimiwarefasaruf.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/64882872185.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/mefagimenatafilele.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/f8q7tnmpsk4eqj094mrv40reoo/85876828182.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kaveladiguxelopirus.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/mesokudo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c65cf97efd2---suxufuzafolixamoxiresem.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095243a4e351---90442865518.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1seqeifsbghsemsvlae5fhg2as/xadaraxevumevis.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16108689f57736---tuwoziz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tfbco15m9triq6bg5ict810e2m/buvafixonovorap.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/37539563976.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/pajejabobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=is+viber+free+on+globePDF 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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 10288 bytes
SHA-256: 3fa0fe3380f7c3769ce1a3861506c8a7c6f3a229f571e3e4e3721f162c5311d1
font_01_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 16736 bytes
SHA-256: 5b18f8fd7526a229fdff31e11c239e3c69ac56805fe5b2876772bda9ec9c9f5f

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