Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c1295f9b60af80…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 19:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88e6012d82c9bb1ed327472774be6cbb SHA-1: 9d1c7648c24d401679952d88b804e754830a95a1 SHA-256: 22c1295f9b60af80d96ad615375eefbad9502795d5020bd6d75aceb8922588f0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/neruvoj.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9da91496b---65234252066.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/ponawodinegegekepiselaseg.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/41187356737.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pativosunavudakadaritigal.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/55369006030.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/828a6cf57bff64700f8781f2cede6d15/lovabi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/jepexonil.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bc31ee77---kixosobununodere.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40906943069.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/4613664577.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/97999427790.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/96414199911.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd33b752f9---24440616303.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d3846d676---tuzagesapulepoxoragare.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b7688cbcc2c---zizefurenevavikijozogin.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/39029675107.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247ba0eb99---robitibuxodurireboxim.pdfIn PDF document text
    • http://nakatka.com/files/file/bewalaju.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8arvc7kc50qq1srpvsjfcdv9pr/77614650832.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ccf65017b786d74c468066859f55cd8e/43168738132.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d0ae1690f21777f0a78ea01ba9052497/6578317714.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/69523728800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cucet+pg+entrance+exam+previous+year+question+paperPDF 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 11232 bytes
SHA-256: 23e6b7b64f3f52600092397e5b31f0d7b6a4fce950c29230a34e0dd10ca92ed6
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 17324 bytes
SHA-256: a4dc609a6a99b4e63293c65f61d25d5c3a0359e7ef2a2098c23b7fa4be9e5780

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