Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edcf61e4c43df79…

MALICIOUS

PDF

91.8 KB Created: 2021-09-03 10:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c5902ab3126e606f90d683aadefdab3 SHA-1: 8a242abd59173819dd5ad28944228e030d8f6c14 SHA-256: 1edcf61e4c43df7935b8803b7f5407cd8a8686226168f6919cf51ced96002dd4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Analysis revealed a link farm containing numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and a link farm structure strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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://archerelectricsupply.com/userfiles/file/34828544828.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd096d5f9---lekedivazujovate.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/5208438600.pdfIn PDF document text
    • https://tdfstore.it/file/90296465653.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/raramusutasosedagijizivid.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/sizazipoxusofuvetanuw.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/509588e32455a01229fa30d56b16b7bd/jopuzosarumakokevefogezug.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/gudulaxiwijijigusalolopo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9rkufpc5h813q98i610gs1sn2e/tamilanulizep.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/18598373560.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f94d0f6b4b8c6f1fa1b73942a613dae3/75667706520.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/f2i6kpkvkoujpdl1ssl61sou8i/sokitofakudedux.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/48876309476.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/fojevikimetevumifafeluku.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ad2a76e61275db419e9022fba386405/gelavoripaxelepowegup.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/13964328366.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/rinitepedidukapo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/07d5fff0fbed36d14125237f2fd48b28/kunudopoke.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/bowazosebigapulu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/22834468201.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5a41cqvgnpepr4qepq20br6al6/nafiwupodupar.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69f2fd84d3---77953658686.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///87208097677.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/12859221369.pdfIn PDF document text
    • http://npas.ru/pic/file/kidekewilolat.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/60091714062.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/87796772309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cs231n+convolutional+neural+networks+for+visual+recognition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 18856 bytes
SHA-256: 6a219221baedead4152737f7cfc1175d26a2e98b3353caf48fb2e0dc84cfed80
font_03_sfnt_off0001426d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426D 11516 bytes
SHA-256: a01fd712e6b647ac7ddf8fcf2d4407cc6f9a10851e44c94c63c72cef5d1a9b8f

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