Malicious PDF — malware analysis report

Static analysis result for SHA-256 278a539f01a05a5f…

MALICIOUS

PDF

86.8 KB Created: 2021-08-07 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68e632080f3eaa970e13f2b46cfac634 SHA-1: fcbd44a4c7b7eec07f191d89e193fd11d571ee7e SHA-256: 278a539f01a05a5fef34a87669969a5fc16104d704e0523d46ed4fc235509126
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites, suggesting an intent to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

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://drafthe.ru/uplcv?utm_term=palancas+de+segundo+grado+ejemplos+en+el+cuerpo+humano PDF link annotation
    • http://chromoink.com/updates/file/90855366615.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160837c89b1c02---soxakeromuxedamirela.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071303484846.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mokexutobux.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a116d3867---49893395317.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/m51e97hifuvd86m7o2po22neo4/33183181482.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/56856383098.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uho4taod3jn0rag087jlbdrri8/zixesabusagoketodufare.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20020250753.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/zetamodavazotar.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/60317352891.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/bipaxarevilerutav.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/pakekugivu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969d00e75cd---wizew.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/65ifb8b2vrfp0enjtcfks64u1p/6064079344.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k834db901lcgtd93fmreoqlt78/41373419692.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kewijilinabudis.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/85552710817.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/5883589976.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810592de3d4---girazikoxuzimu.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/lisolizope.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xuwamezefi.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 11004 bytes
SHA-256: 72ae3763d5bb8f3e84c784594c4cbb7b4229627e9fe5a7094fdbe382c927c8bb
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 18224 bytes
SHA-256: 34497804e8cc313c9a9a68fa9a82ff8bce45922d9ce02c5f39c85dba37827015
font_02_sfnt_off0001335c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1