Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c485829f1d7a1e…

MALICIOUS

PDF

88.7 KB Created: 2021-07-10 07:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a945834ef7053cbdbb7055115dfcd3b3 SHA-1: 2e130c4bcd87b9c4e9d0b31fdca9e999b5f6eb0b SHA-256: 90c485829f1d7a1e5277aa969ae088e54810613c3bffd6ce67575f9e30580938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=greedfall+class+guide
    • http://csc0516.com/userfiles/file/20210626212242_kx1abe.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c60db093e---68120906905.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j47aqg3icefor4g4eoe2jl23f2/96351524096.pdf
    • http://vce34.ru/attachments/file/45298292535.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b559ec47185867614906e4685b260f5e/sogikinijejubu.pdf
    • https://motacademy.it/file/70454007686.pdf
    • https://baxsporthorses.nl/userfiles/file/supowupasuxa.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/9696999908.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ec76c3d13d39f294c7a04f94bf852290/98244201705.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9f99cfa40bd6232075e4498a9e295a27/wutenamovotolelevaropuma.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/df90371ca6306c38557ea6571721ae0f/vodisakawi.pdf
    • https://aaaxxion.info/images/file/siwuzifoju.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ad189a94---monakodigikadoje.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fb7804f1---61567472301.pdf
    • http://ccforum.kr/uploads/file/1622655099.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d80be02ef---fiwef.pdf
    • http://grandp.ru/userfiles/file/59305152572.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1f6278c878c006ccb600e3c08e1392e4/wemeda.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f341ee79---faxijozojibit.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d6e73e9a---16102732293.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d4.bin
63101a29caf03777d65aa9dfc55b09d69f3d9a39ceeaad1c0accebdf607eaa0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 10468 bytes
font_01_sfnt_off00010f7a.bin
72d502e59a9008ae31167a81aadc217ff6049bb091b5d222f7c6401a3deb4353
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 17668 bytes
font_02_sfnt_off00013e1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1C 16792 bytes