Malicious PDF — malware analysis report

Static analysis result for SHA-256 b501b27aeff59c15…

MALICIOUS

PDF

133.4 KB Created: 2021-06-28 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 72d4b3fbb23de4082228fa412524b7bb SHA-1: 865b9d88150201d8be76e6177a76715f2fa0b9c5 SHA-256: b501b27aeff59c15a1d9e50f89a0df5b2b59a6805ba3be488ffd443991b37ba4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery secrets or private keys. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1318ca920b---tadafi.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7df8b66a0---5881645419.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9r2fqhfhvecdb7oga827l0qdu2/41115777690.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/93452531e3b838cd0fdeee8797056354/77318970986.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rqrosdq1vpaidpq2ll5q9i38hh/samiw.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/bixibemobuwe.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761151595e5---sesisabedarojidili.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e381051b6---gikelito.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/59036390562.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/lqfc4eqs9oric0kq4ge8rsamaa/bosinakajixazenepozivoner.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kodukulipisal.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/49e379760d07e16adfb5771ad53290e8/79762268022.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c27ce2233---63798726281.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd7466884---nurapubikenena.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/lajomex.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/12789518929.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/wowazaperiripagil.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/126694565460a801d8bf898.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmogml0eh3epn9lcunh0jsacs1/moxabinasagazemelaselure.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/15939407900.pdfIn PDF document text
    • http://www.puhito.hu/uploads/lodulomufujapozijiku.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/764c22c1d3ba63216a187f0bb186a6ed/bufebo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4674635d4---sotodi.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/kuburaxikiteferuxan.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac770ebb7---nuvaxusupedivuviluzopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+convert+pdf+image+to+searchable+textPDF 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_off0001a701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A701 17676 bytes
SHA-256: c3c1313eb8e63980e9f30af18ab34bf4ffeff021184c1609169b1bd2b2c456f6
font_01_sfnt_off0001d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED58 11452 bytes
SHA-256: c739f7887581b2725cea72ae37d76962c3aec3d680740df96543cf938f6b0f9b