Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42b8159f4522cdf…

MALICIOUS

PDF

104.7 KB Created: 2021-09-02 22:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42d2aeb570795a248cb75f75958802d8 SHA-1: f684317195c44c8a4853c5a537c2788e3c5f393a SHA-256: d42b8159f4522cdfc1f3a5d39a31b56e7aedad8db47e1cb478da1a0347aa4ec1
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, combined with the 'enable lure' heuristic, strongly suggests an attempt to trick the user into enabling content to download a secondary payload. No scripts were extracted, but the link farm and lure indicate a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=worksheet_change+intersect+target PDF link annotation
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/bb00b9aedaa704bb3a935b26c5018e6d/90307068048.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed72336d05c---komeka.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/a346c34a5f15c3eca9814761b13b2cab/31272971060.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/81577851072.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/1407770181.pdfIn PDF document text
    • http://lblussana.it/images/file/52799467479.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/95684736767.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ded6b596f7f---fepogunen.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/nududowagikorototo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/5152816341.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gr10koq01i0faau37fga3kp5m1/35146521040.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gewujomafuvowirokot.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/bujewesuxite.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/39166390760.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210618040006_1702372253.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/92844641289.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/tuzefixevevufo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1c5501309---zedamimuvezi.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/13284491998.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/nazer.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072429624c17---xaxumanesipozelowuwi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf291ee87---wewakanef.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/nofodoritadiwuni.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_off00012f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 19676 bytes
SHA-256: 406a290dfdff3d521c2203b2ca27b9b71d4038d15d5e068be4b3465f72af3a63
font_01_sfnt_off000162eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B02 10580 bytes
SHA-256: 4e963c5a1cebd68d3156cb2d076d7cf70ab6d314af8a693d6230a3410c5d8bfd

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