Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2fa5040d827f64…

MALICIOUS

PDF

75.4 KB Created: 2021-07-02 11:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ac7d687a80a147b743fdd1cbe2f83e8 SHA-1: 18cbdf23675ba39712b837aaefae30837c1d4826 SHA-256: 5e2fa5040d827f64ee223fc2d92001f795c21f5b1093b20075fc386c2312ff8e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9903fc311bf42a684460b555d5d7c395/78263279025.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c766f77b077a38886d0512ccf291bb97/65622998097.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1fc88e060---javagezisunotomudojow.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2ed4f5e2d8f9dfb50db9dd090fd0a1ad/gusojo.pdfIn PDF document text
    • http://efrex.cz/files/file/juketirefedufidinebada.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sdups10vhdh06a9k3h730kt090/40142934434.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/lelibagapiti.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160889112cac13---90566796488.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/oev4621omadtf6tq5ain2hnkdo/zolesebifodaxuxifufu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608370f18da0b---13414211057.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460d69d11e---besijanulolubuso.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/31235982169.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/66425342687.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tr1m0n4mta3h0g52r3plp0p41k/76069006391.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ae308a04---gimiwetovefegodowijenilop.pdfIn PDF document text
    • http://rts-3.ru/upload/files/dixako.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/fipupos.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/92413610635.pdfIn PDF document text
    • http://ibb-online.ru/f/file/91224440934.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3f4738a39fa0248e4b543ac73cd7befc/feketugivejas.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078156b2df80---60827885137.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9778680d---79344131712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+tv+show+brandedPDF 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_off0000c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10460 bytes
SHA-256: 680d6f0dbbd6b822af4c88417f43b2d11035599056f225144372ac09a4c7d67b
font_02_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 17080 bytes
SHA-256: 5b3c37d62c95badff6bc80b60faf7bf946298caa784d6738ce79a1c36151ab1f