Malicious PDF — malware analysis report

Static analysis result for SHA-256 da847a06af6480b1…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 14:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cadd28ea099b6635c82056727df0d42 SHA-1: 40e99f77402914f365523befb22ceb644bdd83d2 SHA-256: da847a06af6480b1c3c5666e448de65ee26c812de2d8e4fb7e008a2c07776e47
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains heuristics indicating it is a link farm hosted on compromised WordPress sites. The critical 'SE_SECRET_RECOVERY_LURE' heuristic strongly suggests the document's purpose is to trick users into revealing sensitive recovery information, a common phishing tactic. While no scripts were explicitly extracted, the presence of multiple external links and the nature of the lure point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e480730084---sopivufa.pdf In PDF document text
    • http://flexicourse.cz/res/file/63425723723.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ke8fqa9mphkeocejh81n6fj575/gefunitegubajurasevufisel.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/15f0c8ce1e13752caaa1b39628710ccb/pexalete.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c8da96b5---togoga.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/32232442339.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c984ee33919---majugugezorukopexejimobip.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/7586277877.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/da435cd75aad9b41bd4d78ac2e671d59/wevolorimesubivokefet.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3ff3c233f83bff505ca5202140d4a1a4/dumaxoligajup.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b4669c66---85267560659.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58810062848.pdfIn PDF document text
    • http://akssert.com/userfiles/files/vogalisidalis.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d519600667f---82355889612.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b919ca1796bbbc008fea4a4d97a14701/87180446726.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabeb89c4b9---38470899018.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607123575515e---xewirex.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16080efcaafba6---tafesunafawikar.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/40a972a00fbb275371529d3b69f69418/nogusixunaluwokilipo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d219d18df03fb56d2e7b5e5712278680/nituxiwisafat.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/vrvq1k3cipjjmee5trosqp0j21/xawobevajafaxusexere.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4ae26005---tesobuxopozipejafuberev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=information+technology+auditing+and+assurance+james+hallPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ee812da8ac9c82d967285ccef59df825/62488322150.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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 17076 bytes
SHA-256: 7dc6097581024ea1e6b062e573f9cd63d4ed3221e009cbe1e10eecad4e672dc1
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 11216 bytes
SHA-256: cc0700cc515aab2765e3bc195918a9e470f802e598fc029a1c3b5a6ee0ffc56b

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