Malicious PDF — malware analysis report

Static analysis result for SHA-256 3565a44ab47b107c…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 21:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 33675b65e35b0c52c5c90c9ef4f4e560 SHA-1: c724142174737960545de69a51ad0dea1543f910 SHA-256: 3565a44ab47b107c9cf0a7d853ae4c50e82d94d2702a90d0b4c602f179af6db3
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://smidgel.ru/uplcv?utm_term=small+white+dots+inside+eyelid PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1f48ac353ca866d8ca3d1535b1ccbae2/tawanodudezagukixolap.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4d1c2367---85676520720.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/wibifiwase.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bqpnu1lb2d2ri1ie4c6ttc7egn/dovajitimi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8rhevmr9mmp34rl84nddntumdu/sebikuwikapivoni.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/10380221800.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/digisaluwiz.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/37032955151.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086aad06b085---86844011936.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4abac499---52580827209.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0079bc2e8a60a438c0bbd7aa1feb6750/23548505656.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/kezedel.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210619125755.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/82230015624.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b191692b48b6050a51cb1b8430b84633/kimuramebulilozotasuf.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093240dae27e---794046844.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5fa586da3794dcca67348ccab2373b7d/majutemuturasafavatoli.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/54ktnf2dc4a64gfece1gv8g94b/veragaxumapamak.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/wuwigatonuraliketaravuf.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/14889671838.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a196c174ab6---toropotazef.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b340659c0c7---zapipuvedegef.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91984514d---lokuwivivugo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5dd20a5aa---93787429538.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bdb587828ea47442de772b9e8171255a/80354689112.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10688 bytes
SHA-256: b732d31132341ac5b79f9fe59069ff498517f96f33a2dd9a1d3306d2c5350614
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 17832 bytes
SHA-256: e852688c0dca06a8d4dc33253bc265d124df433f8fe2395d1e603d06c7ad034a
font_02_sfnt_off000147b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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