Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f1525312d26d81…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 23:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 383aec68fee7fc4e6bca554593019d83 SHA-1: 9f3a1d0751a811f8ba2af1f46e8577e982c5f1f1 SHA-256: 17f1525312d26d81a728b54053eeb52fba62ee3f7394ae356015368b8c865e31
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alquimia.in/admin/fckeditor/editorfile/15627376346.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/rqko0817iht36cui6fa7e5k2tn/rajarivijapovugakopoziv.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4db6bb3f---31386940672.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f6152c0d0---32894661714.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb571e1a0---makozufe.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0163441003---jotilojejegamovobunegafo.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160816a96ecbcb---basanokobekisaxije.pdf
    • https://gregor-biffiger.ch/userfiles/file/69349050032.pdf
    • http://gleneaglehoa.org/images/file/74524463676.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/02158514911255fb60869fc534e618ca/87867090281.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e390d36b---55803648512.pdf
    • http://vdadanang.vn/app/webroot/assets/files/nubulatomekojid.pdf
    • http://taiwanglassgroup.cn/userfiles/file/17445093825.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f1abdc5e4eb1317e134a10654dad4b53/44872339419.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/844e56e5772a14c65544b2c3655b7413/gawovufof.pdf
    • http://hphs1958reunion.com/clients/47465/File/xamejezoratijud.pdf
    • http://aimic.com/userfiles/file/pasuvujisetejozilo.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r04plht4fb81df06us86nvpt3u/jirexegitujinovav.pdf
    • http://niezapominajkowo.eu/userfiles/file/29397023835.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1fc713f156k7vadmb5fcfvb8k5/salokit.pdf
    • http://ros-grad.ru/fck_editor_files/files/60425534595.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9da3bf03---87206118497.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/97095105995.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c5c0d4f3b38ed90e76bb36b3c494480c/66397166942.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=halo+games+order+of+release
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea6.bin
0c745ededa182bbacc2265bdbaba74d5a95d2e42fce09f87a8d4919939c69344
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10392 bytes
font_01_sfnt_off000105f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 16792 bytes
font_02_sfnt_off00011e09.bin
d67c75451ad415e9cc023f8fd08e184a633a3b13c1adb7ffadfd2c96243e6d8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 17080 bytes