Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5d5dadabd772e6…

MALICIOUS

PDF

122.8 KB Created: 2021-06-29 04:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dbf2f2b090d322133117b1a9b2bd3d55 SHA-1: d87940e43236ccccfacf1b7165e41f1dc9c53f49 SHA-256: 7a5d5dadabd772e6da85a2238de1d1b44d6a071501cfeb1492ceb3dd1e642116
164 Risk Score

Malware Insights

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • 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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1195da61---81855735108.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f49817b85---xegagisuz.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/borebuvixaxukelaxini.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba32f494fb---gipabesozozufiwas.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ea5c1b8e0---39690921431.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160819b4b0214d---morinujinobesiso.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lj93n627k2ltbpcsm1gpaodg46/56232522329.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/10c7f16158c49154b273dc8000210d05/74245120669.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/pidisowopozanu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160797f664ffa7---pumipoxer.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/tudoti.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6938bf57b---66783867205.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210622001105079860149xlr.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf6e2c589---73346498993.pdfIn PDF document text
    • http://banghenails.com/upload/file/53606456017.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/ramuligakovelaxatunod.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59bf873435---75183686721.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/15183457100.pdfIn PDF document text
    • https://ibextrail.com/editor-images/zozat.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/566bba906ce68e0a90021378ccd32b44/lewexupupuduzijuzemepoma.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/44507110956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=double+displacement+chemical+reactionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16643 11020 bytes
SHA-256: 93274179fc643ca35335ec5c6289f14dc5eafc7df046c9efba39318679b2363e
font_01_sfnt_off00017f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F6C 18256 bytes
SHA-256: a083e935dd6300db15c93aedc319092f3dc9409ae2d7c6c29ac89b3089668908
font_02_sfnt_off0001aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFF7 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off0001c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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