Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e6b2e8914f3e6…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 16:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fb289e951f4c0534d9edb11f53a41c0 SHA-1: bac5ea86b2fba44bc2029d052885c0be2b5c0043 SHA-256: 834e6b2e8914f3e6efff3cc11e75ce026a2bc2ff506a2bb0d8de351747418276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or lead users to a phishing site. No scripts were extracted, but the structure and URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nuj9pr9ajuh7trkvul5oks8q8u/kibibup.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/08e3fc062181297cb8a49fe513598108/tidegezekatapomo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xopepujolejejubo.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/58600298303.pdfIn PDF document text
    • https://iwistw.com/upload/files/28939755951.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6a87f31c89aaca992f5c485c75e9789c/xidij.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1a56afec8798eedf4bc14881f6b18d76/rakosodosisiwinizogaje.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0908249f2c7ac01c7db93aec1ab4a36e/20292324871.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26099454d8---simaba.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/naxeg.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/53a2ede591c8bacc6b0a17141b37a94e/vusukafexogorivaxuxiwuj.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/13967153059.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608442cb2407b---19571558827.pdfIn PDF document text
    • http://apvn.info/userfiles/file/37802094441.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59335845201.pdfIn PDF document text
    • http://aven.su/userfiles/file/16765114173.pdfIn PDF document text
    • http://agro-partner.com/Image/files/ponusixemogekafiz.pdfIn PDF document text
    • https://penal-garazh.ru/files/didoj.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/nasodigemanusedoruvu.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5d7750e1b839797d58748fff0492468c/vopenoripulokagirativino.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a71lhrl3scavo9h4cqhr26o6r3/xasebakumo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc2be0ef2a---79678854660.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4dsdaogo9spgtsetsera7n4et2/1931112093.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/sojow.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608528b9f1955---xojafexuragolin.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/70e441f06313b78bbe97e3f6663ebcd4/wugosunugitazajoligorexo.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/33113628115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=excel+weekly+hourly+schedule+templatePDF 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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 11060 bytes
SHA-256: 0b0a926f36b49a81175c6b9db11f5d1f09ba8671e907415c0bb8a61912f03097
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16800 bytes
SHA-256: b635eac43cf00e11f87d1c3496404dab955fadccf13292f34a8b561e5887519b

Open this report in the interactive analyzer, or submit your own file for analysis.