Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffdcfbd690384c1…

MALICIOUS

PDF

77.9 KB Created: 2021-08-31 02:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f43617ddb4b442e636e3acf18718aad4 SHA-1: 68c346c2cdeb98ded8454490b95e4c33bd4684da SHA-256: 7ffdcfbd690384c1f6b5172dbd000087e598cad06beb878401b614e6867aadd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to external PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns suggest a downloader or redirector role.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://amadpich.com/userfiles/file/5910060810.pdf In PDF document text
    • http://hncastlecable.com/d/files/54623680471.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bfaf73dce---43207987146.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/pofabekikoxedudowaga.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/18155539223.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919d8b102d6---32569754654.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/30765728194.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160deec5c7fbee---24270258233.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088568ecd105---57079270366.pdfIn PDF document text
    • http://maxbrio.kr/files/files/68001867551.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4dc3867a---jejafomekukovere.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/874649071.pdfIn PDF document text
    • https://oliogalanis.com/file/26933066759.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/fotane.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/44209591298.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/50915014317.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/godegojifuxevug.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c4f9e41fd688553c0fad028410348c4/63603597663.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/74a29cfc967d8dccc6600373f9bbb3b5/jitagifusubirusenafim.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/60579168689.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tpuq8pu6ko5b0auc5500a20gip/75451886442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=general+knowledge+quiz+for+13+year+oldsPDF 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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 11292 bytes
SHA-256: 482a34dc25fb72a9b383e150e2f730c1a1723dc3ab68f52380c6b8e69ba9829d
font_01_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 17160 bytes
SHA-256: 8d06fac2d20358b19d64f4fc8333e957cf968ee95609255bf1760102b73612ee