Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f89707d266c1458…

MALICIOUS

PDF

100.6 KB Created: 2021-09-12 04:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abf928c5b2c162442ef9d59a9015d956 SHA-1: 584167b1a90db663a20bf1d1b749c39d520bcf1c SHA-256: 5f89707d266c14584b1d7c699b36a38c594c1f7f83572f62254f5e6c0ec838cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://smidgel.ru/uplcv?utm_term=psp+for+android PDF link annotation
    • https://agrilaui.com/userfiles/file/finoliwizore.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613475bd8d910---96091568500.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/55000812467.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rumiji.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/feputigov.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/47500577919.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/sitofepeb.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9bb395d8---melakumalew.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/luxigotowetezubamoxa.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/44874336613.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/xalunadalisetawasike.pdfIn PDF document text
    • http://thegioioto.store/upload/files/4615629900.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/xejovepowubonugo.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/33984012544.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/rupixagemegasufux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161351b7f59a3f---73503932233.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gijegixeva.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/62090422603.pdfIn PDF document text
    • http://apex-architect.ru/images/file/nuziperelanarijuserepela.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/42657180954.pdfIn PDF document text
    • 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_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 10216 bytes
SHA-256: 52a7e5c6cbbd5c671029a6d390b857c56593908c5900eaf719c22c43250a26de
font_02_sfnt_off00015545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15545 18316 bytes
SHA-256: 1ebe6cf59dbd40ae59ebd50b3a633612c98436ccf575468219493307ac158e48