Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3c6ea4079cfae1…

MALICIOUS

PDF

92.9 KB Created: 2021-07-06 09:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46d0faff0e1a7716b5df984d1883cf0c SHA-1: 5609f84677b273548f6330af9bc8c295b85c1b78 SHA-256: 1c3c6ea4079cfae1ecc5adf07134c8f3547c9d9b670b4667073e772efd1f445e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which are flagged as unknown or potentially compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/42fe8dfc550997eb39e1df812b51112c/55981449703.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96995e50f---25689506695.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/zexalunaf.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/pedumurozan.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/21806424401.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/5061129810.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///37021237004.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/77109219801.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/50221099488.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/powalonaduwotebesir.pdfIn PDF document text
    • http://fittbike.hu/files/file/zamido.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba7e5b76a---nalidoluwalemo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89b4e568f3---2582586901.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/d6n5di3pi1u4lt62u1mea376h5/lagodutude.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kojaretisinenigiluvo.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/12471205478.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f2e66e519e62f1869b1ce06fa85d5e4b/81826028529.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/206cc3feeeb9126fafd03b5f11398cc3/41127474193.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/45935079106.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/686335e89692c406162295de14519a21/wasanalezuwot.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/pobonizasobafop.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/26228901710.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3087068f1a2c4332f9bc93b4f91dd647/xebosovi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ag792ae3j1pp86l6fnbn3pl7f2/14449650697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ly+adverbs+hyphenPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 17288 bytes
SHA-256: 4a0f1bb6d1cce3958a911c12f7f6ecbe1f022f2eb7578425629ac089ca31d02b
font_01_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 10412 bytes
SHA-256: a1aba384e3f98f164273ed8876708fecab4cc552a2fd830a1bec9d0296ff48f5
font_02_sfnt_off00014d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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