Malicious PDF — malware analysis report

Static analysis result for SHA-256 58286cfb9016bce8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 08:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fceac63cc6552c15684388307c410ec SHA-1: 505dc4c31e086a7acc6a3517b57a6a8f8519db8c SHA-256: 58286cfb9016bce86c46c002931baa6e60e3f8d904cdebc910c38093b9117cc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript further indicates potential malicious activity, likely for obfuscation or further redirection. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://garglob.ru/uplcv?utm_term=fau+g+fearless+and+united+guards PDF link annotation
    • http://hgbs.de/userfiles/file/ziwamutusopifeke.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fba455660---dinegitenabasitopaxuzezo.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lomiwamuk.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zimuxukagotop.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/66241371858.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/35186411657.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/676473671.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/kefozarigavelaxitavig.pdfIn PDF document text
    • https://majubesar.info/contents/files/ronogivopubogidopowuwutak.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/xukajepefufazivulovuxa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145860b41df2---8443824523.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cd260aa6---kulaxoxorepefefeb.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/luwosokewaleg.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41c90245d---54438401677.pdfIn PDF document text
    • https://wasael.com/userfiles/file/mufedaluwugexakojowewi.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/digaxuxolerekin.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/70516965997.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/80075421684.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697faa7da1---63575054262.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64008567159.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/31343204885.pdfIn PDF document text
    • http://greenld.com/userfiles/88530039142.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614923594381f---30084116674.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/55662712824.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/301ff9d03273770a41c00a1ddc16a769/wabativipiliruviloki.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_off0000c3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DF 16888 bytes
SHA-256: bf4fd114cb82da46623e7a531d8c2482dac312da7366c801d40e6dc277251065
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 10484 bytes
SHA-256: 3ebf2d4f5420506820b32f70ed51e730127e6ab71dbfa4737d9c8db7af499ff2
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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