Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c34240625d96ea…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 00:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d527310a123c4d746e8f426b191b6d1 SHA-1: 259f40d772b2f666cef5571778cbcf414b438d05 SHA-256: 43c34240625d96ea9d5fa84d0483b623fb6577bd07acd9ff717d14d5c24855d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the provided URLs, masquerading as a file conversion utility. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=how+to+convert+pdf+to+tex PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ca8f7ae284b9fb2ee2e6cd878d3cb56d/87372776116.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/maradogupogelasosukode.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/24847481402.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d4ccf26---93252603809.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/87513086478.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76d621fb1---39105724920.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609185e96a405---pobunulorirufet.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16120b2c79a749---79655806065.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zepurixerofim.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/govudujisital.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0e229f85a---40018243993.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/93629404136.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/63032237851.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2970e96425---34936970904.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/pomoxazew.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dabacj35at8t895ohtamem2dn2/52698569719.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a2426438aed8beca87b25acfb96d4e71/38051443032.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/49819685050.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/bamiwifovemixotiribed.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q7tsmsm928uu37hktqnbnauup9/donotoroluri.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/36628949888.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nalutodedilikan.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/vapujovulipisikubazimu.pdfIn PDF document text
    • https://aashianarealty.com/file/bebuguj.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/vawadixusubuwuxezozo.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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 10388 bytes
SHA-256: 0936b08289f62b4ad7421a023ac661ad4e2d6a01998c1279a1f746ddabecf5fb
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 18788 bytes
SHA-256: 124ccb56971afffb7154d755641adcc8b27eaa68fac4556a7d988b9bce747ed0

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