Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1cc2740a63afb6…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 00:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 339ce7b224ce671bf1e91ca08563d7c2 SHA-1: f61595c2b6a485d618b833fbc04ef43dffe2fdf4 SHA-256: 5b1cc2740a63afb61923c6221f545ebf6e90f756b38b467a55039b6e178c8ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://safeabortionnepal.com/userfiles/file/naparo.pdf
    • https://people11people.gr/uploads/File/64937320161.pdf
    • http://alimentosldm.com/userfiles/file/fomatefidalevububunev.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/su2o5u7i15qm4ug9b41ddlv4j7/zuporegadawuzemupezalu.pdf
    • https://pearproperties.in/userfiles/file/gibedaruduvowerod.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71e404737---suvolor.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/f765f32509e8191a79c7b2ae81943be2/pafinanofesemofenagip.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/woxukepuxo.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/010d335204eee80381aeb2d01de9286b/79901169542.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/04554eeca46fdad2a64d4f0affd3cddf/78154057037.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c936f1b969e---begugaroporulezapugamakik.pdf
    • http://auksozvynas.lt/userfiles/file/33386491274.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca713b28b9---89414076938.pdf
    • http://adabaskimerkezi.com/upload/file/51607295837.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0621f961bc6bfbeb5f09ac2f5fb649d9/72026536645.pdf
    • http://lamelove-zakryti.cz/userfiles/file/2603328042.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db655343e---xumezunupajapoluxebe.pdf
    • http://shinies.ru/img/lib/file/82089211230.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3bf1ec1f---rerepigolupis.pdf
    • http://prodottoitalia.eu/userfiles/files/46508076574.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709bf958af6---vavajoguli.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fef97ea03---bosetatog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=alright+song+mp3+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12a.bin
56a8015d744c5afcc90ef3b183afbb9329fca46c65c70c9cdc68cafd2d8486a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10948 bytes
font_01_sfnt_off00010a32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 16792 bytes
font_02_sfnt_off00012244.bin
16f0439d55cc1c713a45755fc15d06f7e12c6e39f9e1729d76596ddd076a6b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 17776 bytes