Malicious PDF — malware analysis report

Static analysis result for SHA-256 da81087d81232b6f…

MALICIOUS

PDF

85.3 KB Created: 2021-08-25 04:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f30a3284b89c27b8a7a097c3d04942ab SHA-1: b7d6afe25f0a1a1207e210ab1d7b1cd6f293ee1d SHA-256: da81087d81232b6fe0b0551812c902d0f05da0b1bc6ce487b3e4dc7f3fc41144
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.potravinyav21.cz/ckfinder/userfiles/files/78487771014.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/3619596152.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/82954626588.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/15672105152.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/37271335853.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/92603481325.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c3h6o6o1vgsknhambif7utf901/wipeduzubeg.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/19593706465.pdfIn PDF document text
    • http://halmar.info/userfiles/file/xufitewu.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/bituzimimegizokuxes.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9935cb5d---40139296653.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d21c172d7---zokoxuxivugo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ccca368f---bugovox.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/dofixib.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5d09f3c6070c950de0ced6c554e1ac7f/93439588856.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/chbbdjgpbeubjghbasmuvaj9dv/kogaroxudikojodufuda.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/23655142626.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rebulufidutesezonobori.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/xubasi.pdfIn PDF document text
    • http://boxethai38.comupload/file/88263606586.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/resifiwerowovijo.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/pufabopixevovuni.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/497d1c2331ec5e63b02ff311e3696a83/6248066276.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/wetizevajate.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/13902500873.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/24895285905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mini+weenie+dogs+for+salePDF 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16760 bytes
SHA-256: 3e650fb45b66145473f91d1f9ea49f7cfada253a447848ee06bad5d02adffa62
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 10508 bytes
SHA-256: 43ca5fa0a62b0b2cd9ae4934133b9a96845f122d5445ec3e0948a335c494a189

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