Malicious PDF — malware analysis report

Static analysis result for SHA-256 1758dd675f77f3fc…

MALICIOUS

PDF

83.5 KB Created: 2021-07-13 21:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed8f53b8956cbc866590937478f92de5 SHA-1: 62916ba05521ae18f1eed6351e0d5ed84bed6712 SHA-256: 1758dd675f77f3fc77d1a6154a82d6cb60b660fea9f25d1aa1108ec89f0cbd68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting a distribution mechanism for phishing or malware. The PDF structure itself does not contain readable content, but the associated URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071970c78b4a---3528030958.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde3a073a2---25159823496.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/28264764613.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f8fada742679e8c99c4971575e2b40c7/73746023831.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/puranadepamutonal.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/mn9s42jech7a2tss5d8ki6hm24/32977191801.pdfIn PDF document text
    • http://candientushinko.com/images/file/jazopo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e2e6285e---xinulakiru.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/lesosajogavuwemezubuwivap.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f0e659d63---ragawuparagenom.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/541b10mdd6nv3oki2na6640cc2/fuvipejumapevexijamimugub.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/46326358515.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c05384ee8b895a451580b9e7edfc8d1b/ronopenokelivisero.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b434f2c0a---54604972415.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uvc4mlgd6rq2ol4og3qjhlo2kq/27705864727.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8c4b44fd---gotevetodixejaboruri.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gumumuxoganuzize.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0fd06d493e1d97bb6e1ce4dd1bf41dfe/wesitojoxepikisazok.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d5088915---xeluwakagejufuvafesojuz.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/45441015638.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb56fd5181---65362078806.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2cunhq7v4se9tjun908lf9c4u5/sogirogopiteponuleri.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/85776129247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tension+in+sciencePDF 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_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 17076 bytes
SHA-256: 237d7e84448bce0242cf0856d4a91e5d8ba07aa26d33b236f8c032d9d164a546
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 9780 bytes
SHA-256: 7b92a0eb5fffbcb891a77cdb1c881b37c2c79215cd74bc9053ba12106ca6a0fd

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