Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb0881eb92fd533…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 20:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6f691591a2f6570af924c4d80a5cd5e SHA-1: 128685c9e0971384cb78a5bfadc8408891f006dd SHA-256: 6cb0881eb92fd5338a2d1eb9c0d8dd738cb3143c47548dfa67c45bf9a0cc9158
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of these links suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=fundamental+of+nematology+pdf PDF link annotation
    • http://younewstoday.com/task/userimages/file/rewolapoxizap.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hdbpj64ceobta5fs3vvr31b294/tupipujebipomajojun.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf90721ed1---4000733842.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/tuwafumali.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efedebb03---vovimereserilalakurikab.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/58371500114.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/negabiw.pdfIn PDF document text
    • http://fkhd.cz/data/img/vipes.pdfIn PDF document text
    • http://ashioke.com/images/library/File/riwegofafizimugez.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ba87e609---kewiwudevox.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5db7ddf0925afe2fe9b2d95a0fde9e78/lekawiwubokujovotofiwena.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/u5fghpjafn821eo761qlmvjf4d/xadotelusodox.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/gegodudefen.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tebhu5omvfuskkq5qfvjk58of2/dajubaniwa.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/tapaluxadimaremijebu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/fesaviweravimaduxutidigag.pdfIn PDF document text
    • http://mp-journal.com/media/file/272183878.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/35p87radln8mn6pj9l8r1pqih2/18704295130.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/gozorimovikirawu.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/gigutepoxewovijaratadela.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/xolijo.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/47447086952.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/mofomoxeboze.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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10672 bytes
SHA-256: 723c41f0ddd78819446f4363867860db90687c61a8bdeaf827b9dcac6da058c8
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 17760 bytes
SHA-256: 3f4f925f64cfb4f688772c76268b8686700bdd0a2dc31cf05280c0a92bce8c03