Malicious PDF — malware analysis report

Static analysis result for SHA-256 239ae4087346795f…

MALICIOUS

PDF

88.1 KB Created: 2021-07-31 13:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c42b6824b8107e2926633854dd2ffc74 SHA-1: 1d995c4bcb052a8ca251d71832348c518c4de5ae SHA-256: 239ae4087346795fff4da3d3f933472fdb500c5f8eb0fd65e481d2a865f4d942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=vocal+training+tips+pdf PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b7add063c65acc41515e8a4df5db2751/81870835949.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8a4d250de4bcca6f3fa79ebce75fd2fc/47212513739.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ee83619ed6a9cb4b063fdb36c606d0d2/3637533173.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/314950269.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0268ce824a---pelotarusoserigo.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/sulejibezovarodoji.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3060e64c0---11448254479.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/319f814b26ee419c4ea526895d11e6f8/40113451270.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f39a4084---lazozisile.pdfIn PDF document text
    • https://designclarf.it/file/zibosewuti.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1rtbai9o1mgpuj92ppbrq0jj33/zizatigami.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0npmhrs971ac1kk02pjrqtc809/26280918379.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/geliduzefezusagapatum.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e795faeb2e---64205900871.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/69491264315.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/76629779758.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gr28haudog0pak7e9f1ssb1d08/18706993446.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/kijalivemulib.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2f7dd6f6---vudisajuzelisazopuremo.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/gaziditimebawakowutegomu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/6945113767.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3d1555a77---12289329564.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff7419fed---zisiw.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nolowomelagegorusogelape.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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 16908 bytes
SHA-256: 72fc4163d23217cc1a9d2362744a49451d89f1f0dbd7a98009f69528b434a168
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 10632 bytes
SHA-256: 4f425016e56a8b92875e00adf38497c57f5e23647f69b188014da06def180f75

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