Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4ebe1e2e6d12a7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 04:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b1ec460ada7be29a15a3f202790720a SHA-1: 39d759e14d6639f1e3eabec8a9ce244c56761ef0 SHA-256: db4ebe1e2e6d12a7c2dddba3977447f18ef7a52843ca1ed498de2b6a67b23c80
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Numerous URLs pointing to compromised or disposable hosting are present, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://studioingegneriavaragnolo.com/userfiles/files/jepivi.pdf In PDF document text
    • http://superfishinglewood.com/uploads/files/22582203889.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/44221235932.pdfIn PDF document text
    • https://digireg.dk/upload/74906134975.pdfIn PDF document text
    • http://klpa.net/userData/board/file/xopuxorarafedu.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/wujanomemenoruw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c2055cb7c516e8462d64c724ea48d672/38509991683.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/puxudajeposiguzel.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/pujadujamagazakan.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324a58ccd9f---nefavakowolakokipumi.pdfIn PDF document text
    • https://khanikango.in/file/66670778727.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vexowoparox.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/23971827981.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/e9p6j0qpp465sot90lva8c2hko/xupibejav.pdfIn PDF document text
    • http://hoachattn.com/image/files/nereluvuliroruga.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/xilapikefazijekipoges.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/balugifuxafasudebujodew.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/49772083585.pdfIn PDF document text
    • http://edallyshop.com/upload/files/guzoj.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/soxewajutikevet.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/toloxunaxusosotifoviwovi.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/lulisojinupobesok.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/40883433176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=technewztop+zip+lockPDF 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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 17224 bytes
SHA-256: a88e7654f8db6ba127f40956dc7cc31941d8897f64366b97178cdd31ea383bf3
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10240 bytes
SHA-256: 445d5e65c5a24be158bec47dc820e9684280ad847194cda2db901b27afe5a0da
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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