Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d5f325cb7bd318…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 16:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3802d8e67a59ae8877967a3791133597 SHA-1: 0159079e82cb27c7b9e9abd6cf40bc7aeab0d0b8 SHA-256: e6d5f325cb7bd3181f80b4d2760e5e388e22782c98379bb116a7c7bb5c419aba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of external URIs and link farm characteristics strongly indicates an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=fast+and+furious+8+full+movie+online+free PDF link annotation
    • https://austarpharma.austarchina.com/upload/files/74084410208.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d9337d1da---xepidisupe.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dukulukowibeti.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vep78ve9nfpekt2ni3ri8kglke/57223111596.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109140904444270.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/lubisova.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece4d4a572---xazededekesesoxajat.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/sawiduwuli.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d39c6142a---74598069422.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109062312092507.pdfIn PDF document text
    • https://mangallagn.com/images/file/rubevamotulojoxix.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/veruf.pdfIn PDF document text
    • https://cape-electronics.com/media/file/72173210233.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/kefofamuxovozogo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/tawogubifatuge.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/11893082563.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/gisusugemaxofezalugimaju.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/35927896655.pdfIn PDF document text
    • http://synhbio.com/upload/files/sewabezakejawabawivozoriv.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/68428844019.pdfIn PDF document text
    • http://17njl.com/userfiles/files/58525897756.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fofetisipetune.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/17666647666.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_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 10868 bytes
SHA-256: 13c3a844dc50e4059894a4f1f29f7cc2da23ea0d752618c1ced5c2a7e7aadeb0
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 18236 bytes
SHA-256: eb23549ca4aa8d0773d6b9a174e82007e82aeee5e81c3773224029c3f8b2c80a
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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