Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3d091ba7cf40e9…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 02:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4df1f840cc6427e993df752c8566ef4 SHA-1: 43d79f4d3da4da14f26b6ba5572f0ba3934ae9dd SHA-256: ed3d091ba7cf40e9be2de75009de9d5fabfc06bd0f65a031a21ae02dd5dcdd8f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are designed to lure users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://shreyaghoshal.com/konadnew/userfiles/file/27022956562.pdf In PDF document text
    • https://eingangrad.ch/userfiles/files/vowimab.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c192971504c8263523e6a2e1b4e508d2/tadik.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/77d24414d7a501f42eabb1d875605f39/23077538305.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/sabomilekeboroledopu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/66112153684.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/24249728145.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/83fc01fa947c38c1f35a9cc2a8776137/86251844110.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuginak.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079c340761d9---mamagulanirunemusurig.pdfIn PDF document text
    • https://bonacorsi.it/file/84452825380.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f5f83750f1c7d93896ff6207da5f6a47/13069654872.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4290873e4---jafarotaxade.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/dabopefamavaba.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5d4c2f30cd3f1af188474ed8e4c183a/50595631616.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7a2730f6---juxitenomet.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kjv6k8a0ucmkueqjli3up8h5r4/51274747269.pdfIn PDF document text
    • https://beaszemin.com/files/fawitopaberisovame.pdfIn PDF document text
    • http://cichanski.com/Upload/file/witigolukiboxum.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/84507201612.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38960952705.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7a3145e61---87064217292.pdfIn PDF document text
    • http://stl-hk.net/userfiles/resufotivodijumobepigezov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=soul+lessons+and+soul+purpose+pdfPDF 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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 17612 bytes
SHA-256: 8b761985234e46a1e98bfba5be4653e28a05688e7725407af3cc8df999f60493
font_01_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 10476 bytes
SHA-256: 22e3adaac07b3a965edf2c340743915e1178dc3fcfff61e4039c1af0294c681a
font_02_sfnt_off0001385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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