Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f5681083f07052…

MALICIOUS

PDF

62.4 KB Created: 2021-06-22 19:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ac942711ebc75d9716ab178841d935 SHA-1: 6eeb3b328e76af754ced3541259d26eb3490cf9d SHA-256: 58f5681083f07052b4495c1d302d8982f9752aa4b6e2dd69743512d4acd20e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure attempting to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=pan+card+form+pdf
    • http://animalscipublisher.com/files/upfiles/file/7247731854.pdf
    • http://lezeckastenakosice.sk/upload/files/73032605423.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27dafd539f9ce26eaaf7231feea3ef7d/60385313909.pdf
    • http://k-souz.com/userfiles/file/zuwejirimovojaxijutijev.pdf
    • https://nisahanpin.com/calisma2/files/uploads/71681713934.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9923db278f---xebevazujopaxikimuleda.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u1i0fcfn03jnboujksjv9k5i2k/25555668307.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/40nimcnbf7ksh76boactjdnjg0/xudotape.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866d8dcc05---wanaborede.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a63bf9b7f2---mederozujag.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/25uaq5c1tinmilqkg8d2r6qi8b/sudunevexologulekurokal.pdf
    • http://dentalclinicbangalore.com/uploads/97122233842.pdf
    • https://ozmutludokum.com/userfiles/file/balavofogubaguwin.pdf
    • http://www.alfapilates.pl/upload/file/pojevatodamojexujetamak.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac472b1495---vobojikuv.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9d8617572c3cbf8fabc5d251d0721673/41333756050.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b789.bin
83e125310b81e4fc823fe0c44a65dd34862ea877b96277cb7c14bb5e11ea4273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB789 5092 bytes
font_01_sfnt_off0000c8c6.bin
123b629d51194916d7da9431859688d1811e565c6d8814c4ae9c5c016099272a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 10192 bytes

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