Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69cf78e10f32d4b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 23:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5100becc5d5e383efb85099b6b48c34e SHA-1: 6f70f633677ff8db3a8576a825eb1ca61cd07b13 SHA-256: c69cf78e10f32d4bc7f4d401cd13a877d68181514a2968723938d1d87fe737e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=ninja+samurai+assassin+hero+2+mod+apk PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6bc6349f4---76783992579.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161300d1519c18---92217072405.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7f5b011a---81876652050.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/tezudezotitogepe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b536936199---zogovobizagodix.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/boroxapefonifige.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/fasobiresafewojakapeba.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/guvogeba.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nogosuvu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/42954757659.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e92bc49f5fb172deb1e237ba05003dda/95138894772.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b255b06497---nawiwipuxulapewati.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/40493747585.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/27338425441.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210902_030516.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/33598024837.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/zuxagijufasamakakakuw.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/nepuduputuwodaj.pdfPDF link annotation
    • https://ceylanotel.com/firma/files/21361991154.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/raxikofunenete.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ca649fc2f694592dbdc7e1f885dc75c7/46572501639.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_082731.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737d36f98c---noxujumejuxo.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_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 10932 bytes
SHA-256: eafb86347bf315852fe602264bc3685ae3e70a52228af54c8f45f86396f35bbe
font_02_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 17608 bytes
SHA-256: 7d20037f963d5e49ca3c35cc57d9a8284855093adde2d3c8a17a50c540eefbcc

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