Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6819d89cc08e2f3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-28 11:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bc9e7e3f81454fd296498a86e5d90703 SHA-1: 832a815114317580600d39b98e94e1dbc610aada SHA-256: c6819d89cc08e2f39672d700a763a0308db082ac577fd7dd93350ef1a729ba62
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the links likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=listen+youtube+music+background+android PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613677861be87---54038932967.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c917940a4---4791224624.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/tuwikagapirivig.pdfIn PDF document text
    • http://orthodoxnews.us/file/xagidasivufuzel.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/gujubana.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fenoxeverinogexogulo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/43883933091.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a9be5491---46077799951.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5987595288d4bba37c55246c73cfb386/87737956058.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/xonotusixito.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f6abb8e5c8b84abc2c42bec91478fae7/46797934136.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/furotigogi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/famizidoke.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/11122368292.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/69805785361.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/kurubere.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/90021048738.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615172af88ae3---befozevitemixen.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/77456614450.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/jinufamoturijupewexidiwo.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/25433122298.pdfIn PDF document text
    • http://thongthien.vn/upload/files/nexujopaputofe.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/fizopo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/75924985551.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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 19852 bytes
SHA-256: 0221721d9956398b9c6f5b9817bb0b95fff4353fa5460fffd745d0e7627c9f4a
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 11068 bytes
SHA-256: db4243a717ff1a834442db33d70375a4f86508cc9ade1ca37f9b9ba6162b7181
font_02_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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