Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f67813af02ef6e6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 03:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19f78bebf156a67b559873988fceaa1b SHA-1: b0cf9642e8389775fba18b2535bd07f09e040b8e SHA-256: 4f67813af02ef6e6730a22bfe6b9494719a58ef805f04991d4b7b8a23eaa86f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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=dieta+cetogenica+alimentos+permitidos+pdf PDF link annotation
    • https://classykitchen.pl/web/uploads/files/95633453745.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04f1f3ddcb---liwup.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9263bdcab0---46669130585.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501112758250008.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/4804874723.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/98067488112.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/dokewexuretetofuna.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16115efadc75af---5982206976.pdfIn PDF document text
    • https://vendax.ro/files/file/56295905756.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/16159976054.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607715aa17ba9---vizegatekar.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kukarerolafisegojoru.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610523632d7d9---rigemelif.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/matozitudomugiwobaxaxuwiv.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901064159.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/16472794582.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16247210600247.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea4619aea2---65040200091.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc35682c9---85915235598.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/10880802910.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021623011189317.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d215a19de1f5802f33dc7f6e08050546/tutalemefajarololal.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/topuzinovizobedadedukaxi.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/97449567921.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_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 10964 bytes
SHA-256: bba2eff5f06f51f4d66768db4a06d313c93daaa28127d4391090438048395def
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 19044 bytes
SHA-256: cc12c11b254c26e245d4b82a2e9fa544861bb8efec844503ff9f987872a8405d
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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