Malicious PDF — malware analysis report

Static analysis result for SHA-256 2381936f7c7b25d3…

MALICIOUS

PDF

129.0 KB Created: 2021-07-04 09:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e6086cd6dea5f2f3f75ea567138ca4b SHA-1: 1a5127c117602c72faed73b967250e13e10c45ed SHA-256: 2381936f7c7b25d3023f09f6219e95271180b53e9329d842eb7806efa7131c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what is inferred from the heuristics and URLs.

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 https://al-farh-iq.com/upload/userfiles/file/jejomegujozorejubulo.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522193339200108.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/79e56c7c52e1d50cdef08093e1feaf7c/vowiru.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f4a5ea047381c32305fffd8b9f57d805/winodinebiwepavonavifa.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/93873431806.pdfIn PDF document text
    • https://argumentua.com/i/file/57832737012.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cfc945ec---21823931421.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/89861796398.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b026fcf68b---27556579638.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/50577244553.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/bagunimefemo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5eb972c8---14138144698.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vn2sj64uah901g4hud82mse9ji/ximoraxanunurivukume.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/takuvuzite.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/bowasata.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/71334757355.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/52439759a718c7f5bd8279858bf929ff/sosigaz.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/funozoletogafasanusese.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607484cf442b0---23648474891.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44d7857ab---kedekijenurikif.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/91280751570.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f56e07800---39537599782.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071635c25b9f---nasuligapetugisizuzor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=norms+and+values+in+sociology+pdfPDF 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_off00019361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19361 11124 bytes
SHA-256: 407ba7493028c190b92f21f517271968ea4847885fd40f14107a4ee757b348fd
font_01_sfnt_off0001ad1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD1E 18812 bytes
SHA-256: 8a5f8a72f0d48a0fc7901e57b4e3246ce8abeba19324ecae47a0f0f985900956
font_02_sfnt_off0001de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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