Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2fff736e44f580…

MALICIOUS

PDF

96.6 KB Created: 2021-08-03 13:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42c1a5427ff673566f1736979120732e SHA-1: d0db844b48f83d2e24b70abd8802273602872d4f SHA-256: bc2fff736e44f580319902a9b4ad357c946fef2f3f514f8c2b0cc00f3005201a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://crewmak.ru/uplcv?utm_term=ccna+model+question+paper+pdf PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/be561e7fa4cdb357f70d2d053b5fa6ae/lijopekuwilosixukejefuwe.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/fp4gl6sinqbhplhhadqfkvqgok/71531630598.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/77501093585.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/rowexadesivigironat.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/501b34392879e76e0cd134ead93dd1e4/48779486890.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/52343299286.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/6a3vbme65h7kh6u323q3o2o9a8/dazosubagizobopikazipuv.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d5a2a64793b1cade974f63537ea4e7e6/79603795032.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/xafifazosofusivoloseku.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/12dfbe8b51257c2ac01bd3937d680a3f/vamir.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/duzop.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160847cacebd60---64912339524.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0d9643d3---nejetefubenixit.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/53679080670.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5t106oc1nllla85c6fmaofi32g/94997685606.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed471d9b92---gogogamani.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/t84938ol5gnttub5fuvvh7ed84/pexikirizeko.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/63ea26b3faf5f3d84a6a1f49db09d978/vuvabowutewavo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/861674d0563215e2612b95068c026d60/18056792856.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089606618f11---76067487909.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/87798868067.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da667f95eaca456bbccb3225be5047c/76122122020.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_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 19252 bytes
SHA-256: 3bf374f4ef84f687c4c1e80c5c28ecd27381c460614f4ddfd064511c2a9f2fb7
font_01_sfnt_off000140e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 11056 bytes
SHA-256: 5f3fa77437dd1f86692804fa50e2178ca32bbd6cfcdc41772bd00490aad6503d
font_02_sfnt_off00015a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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