Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9066faec25a7274…

MALICIOUS

PDF

105.3 KB Created: 2021-06-29 03:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4bf2e91301fa56f1faf660874365c04 SHA-1: 0eba7c4d1a0933f842c201a4be7be869bacb0e5e SHA-256: a9066faec25a7274c83ac6e33aa10d6dc55ac0eeb3339ee16676d731d02746d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9h12co0m0pthj1svu10n3ghs31/vasobobupa.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160762974baf5b---vidatugimurinonunixixitob.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/be095a3e1d98b0f313b89fb9b56febb2/rowewoke.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3377bbc2---kudedowomilabewifo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/70501389257.pdfIn PDF document text
    • https://room12shio4.com/contents//files/nikazaz.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/fuwopogubipoxagole.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3eiovvug6kpkhohk1nduablqi0/zasotibimekolob.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/46214589aa8cc96abf44d60e78dd5dc2/zazitudabek.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/3697117828.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/31369964286.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/jonota.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/9499856034.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32e3bc5d2---jutinidan.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d8ji2djg1o4kudrgn7d9i4e46k/95731442785.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3207ba21---vezuvetaver.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/febaf5c3a8461292a60942102dcd1305/lusebotulotexopojexuji.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/gn94tgjpba1pl380ev81vrtvan/17392112912.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e3b111d3edf550d2e57a746ee635b0f/keralasori.pdfIn PDF document text
    • http://mopron.ru/upload/files/wabegatoveme.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ni6i19v3bd9irfr5tr632211b5/josurobibetifolalim.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/72688007806.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/xafuvolofimalom.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/83ggt0h7opkt4dl9cj29bos0q2/feboseposuxajevenefuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=characters+from+ouran+highschool+host+clubPDF 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_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 11052 bytes
SHA-256: c2f6ca02d0abb39c607c927d520ad77a355504a46234419d4734c9ad5444ec86
font_01_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 18868 bytes
SHA-256: 735c42c35aeaaba46a6a9b2908c4a4391d2c934cb1d8606317288c4617675e76
font_02_sfnt_off00016617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E24 7356 bytes
SHA-256: 4cef40e25a09e349129903401073e38b76036d651a722ba527d60acdc0b72117

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