Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a7a8b0338fb038…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 02:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b414f005f7af506441690ea0c78d0769 SHA-1: 70afe3e6f1f3786416e1853ac9edfa9afac6994a SHA-256: e5a7a8b0338fb03872caa3db7faf03ef88dbe8bb75aed09e9543a739e4382c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=install+cer+on+android PDF link annotation
    • http://mebco.ru/images/file/75727900833.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/78921899647.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/33751626716.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc5791a280---ziwuzewodovawu.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/vudobi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee429028d---dobaseboxopotiper.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/75341937239.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/58185703817.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b0b646c3025465f0452487f7260d5037/nudidewugufimivel.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/dewinakoromikefu.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/26748288390.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8434d6542a718a7ffd6ed8efe918e122/mutulusigurigo.pdfIn PDF document text
    • https://edex.co/userfiles/files/rogololupobelovexovugos.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tixifaje.pdfIn PDF document text
    • http://home-plast.ru/foto/files/motivuzo.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/98565417567.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/riwubatuxokisesakesexudi.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/kuvop.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f728cbf0---bofarafugipolojosapodo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b481b88f2---mumafuwelobod.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zuxugamogariwuwuxosamuvu.pdfIn PDF document text
    • https://casaalu.com/luutru/files/labosoxepa.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/duvixi.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/desosegiwizuwokugutepigiz.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/55687953300.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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 10316 bytes
SHA-256: a00d611e0be056274b04666643c3a76c2603e2955b9b1716fd6c17625712fa44
font_02_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16276 bytes
SHA-256: 5d0fa6971dca549ed3db979e2db8c98923497862524402db4e13d49fd700b375

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