Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76375885ff661b4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 03:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cc2f000145648f3c4f59525a72ac362 SHA-1: 46c42f633ff5eeb47560a66e38eb786268a5c5b0 SHA-256: c76375885ff661b462081b8c4ed2878183634c77248c5b90cb13091c56d13496
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seattleteriyaki3.com/uploads/files/76260704552.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161384e445f17c---19575788117.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/gabikudosojixizovaz.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/seregegujetokipefupuroloz.pdfIn PDF document text
    • https://kiptep.ru/file/fiwukavojotuzusu.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/96054720472.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/vijidaxaw.pdfIn PDF document text
    • http://agilesolutions.in/uploads/92381530697.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/58e521d3ec280960f68077b67bc0a882/77900135909.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c9e701017a695a0d1149c88d3ddb57f/26445779711.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/29361467696.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/mapepixusajatexoxabagoban.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/85889725839.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/60828664221.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/zixilopodonadegi.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/vosegu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/43710973104.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161408263b4b2d---fusur.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/60025981453.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xizukubeb.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/97527588655.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/faxeratefadokimetora.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/zubenotelogiduki.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/59771685024.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wuzod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=9+letter+words+starting+with+dPDF 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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 17960 bytes
SHA-256: 8b33504dfae0078189f77ca91394d2ce51f6cdd5e14a2579bf6cc63d1c02c818
font_01_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 10684 bytes
SHA-256: 2c7493a348acaee45b4feced5f25fbb43eb7c5672f9e35ce47a598be3f057a5c
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1