Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a4a250689412ad…

MALICIOUS

PDF

86.7 KB Created: 2021-08-01 19:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34584831a8373b57d181aa1a098a50be SHA-1: baf11bcf150339d46c1cb96d6c48a82f939196be SHA-256: 81a4a250689412ad4cc1a2b8dee3445fc4c41090dc0582222a5d2a3d1cfc57ab
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous links suggests an attempt to lure users to malicious content.

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 https://queure.ru/uplcv?utm_term=how+to+score+volleyball+sheet PDF link annotation
    • http://all-pass.com/folder/editor/file/67733419982.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/95832745636.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa8c57b0c1144d78d7b4ca06cea17865/91945684590.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-20/20210720141324568542.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vimal.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/dobubidojegawowaf.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/558d3683dbd7fcdb05d6ed056a6a27bb/pabenut.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5d7366db---42676185743.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/dca2d8c808184eb65d4f73dba442c46c/monisabimupudebobido.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a986804f399---22925325080.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0738680001620122649.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/46705211200.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4a4aa26a18652d454e1685ca0415d7ab/8225584092.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidabexulekenudej.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd946de1232---zofav.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/dafevatulupudegifubilo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609143e04c81c---wokokutezoropeluluvek.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cu1jqq1s39u5fro7f26p0a0ue4/5975323737.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2baclb1l2u1oiri2q2crktnpoh/52726213055.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/406c15bf7dcc076a0354bd98aa2555ad/zotopanulabomabemuw.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/47478081866.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cp3hensvpv8tfml4qmk299recu/86793330617.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 10528 bytes
SHA-256: 587881d657223479f190e5e297e07b79743a86b87d105ccfead507622633c0a3
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 17948 bytes
SHA-256: 2aad3624397e89a42622bd9aebc89988a91f4de3b1b5de6a083b89a3d8afb0cd
font_02_sfnt_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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