Malicious PDF — malware analysis report

Static analysis result for SHA-256 9342485013a4b1cf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 08:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22d5271be62085a8a2d84c295c2622a7 SHA-1: 5f6a749e8a77fd15c458a469c1c9e24a36822267 SHA-256: 9342485013a4b1cf36e01e25720bc0c6f10cbf4ca37718abc3e818ed5f077c21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=pengertian+hubungan+sosial+pdf PDF link annotation
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vgvri3ho8u789dumomri1lu4v8/pabosumavonujozovologewu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd5a2d75b---69340014567.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/55130026917.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9e8847b073817b927b8807955e04b89f/33747667677.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wujex.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/xunik.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac312dee637---50490024323.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9b1b30a18b4749ceea798adb5c302177/wunofiwolefijimo.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/lafogugofoximiwekofoni.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/51100756877.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/2dfc7626033608cc0b34122f3b454473/pewolusenupumofawu.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/zuwororuvirikoguvaziwef.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/95476148413.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fopuso.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ac0d7f0127d04a2c12fd91b2833aa7bf/tuxodevupawerew.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607502737c85d---62979178185.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1331b04c06933ba21cbc9daeeb8f2ada/4299828242.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7g4qll8ganc1q8pd2tk0e6ot1l/5784093640.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/tiwazevosini.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/38b2788f44274d4057e666066d41e1b1/8531347409.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea72d96b32---nopexopetokixodokejatol.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/lexemuwexu.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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 11016 bytes
SHA-256: e67c5359fbe6bda67acd3d39e2533f46dc29025f3ff6192a544cfac8a7e97e1a
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 16048 bytes
SHA-256: 648484540cd0cf784bd7b277644cab2514e96bcc266b0c1b35ee445d6b0e2490
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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