Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec7a1b96246f6ad…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 03:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50b542e259f19f987868864ff4e98350 SHA-1: d6704147a83f6116f1d88c36ecc1391e390d349e SHA-256: 2ec7a1b96246f6ad80643724b17fccb2279971545b3b5a7e7b8d5823db2c5443
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The embedded JavaScript likely executes malicious code, and the link farm serves to obscure the ultimate destination, which is probably a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704a5c375c7---8519627153.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d063467e---3340205371.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/latexufixevunose.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075519f81507---vawomikilamubejozozigukeg.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ca8f2d80---67740418465.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/2422611478.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/risudalenurodelomule.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/44681607527.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1a6f56b9c---99248038470.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/5944156271.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/61737911504.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a55589b4---sipexawokazulitudixen.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/64485116738.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/85296321705.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8ff7f3275e3c502e679c12bbef27402f/41945566341.pdfIn PDF document text
    • http://paliukenas.lt/i/File/5796723565.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2833f643---6185738836.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/685c763b728544a3429e086c8eb5e8af/rojegirorukigizemokulirom.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce71730fd8---miliresifuji.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/89174084421.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5fe80ac14---datitajawazutajubiw.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/wokozevikowup.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/wifeninopakitawajazawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=icd+10+pcs+guidelines+2020+pdfPDF 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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 18300 bytes
SHA-256: f67520b4bed2b50eaeb5d0bee29f751433da8835b6d6df7da06f4a4bd07c675d
font_01_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10660 bytes
SHA-256: fa7da0c8131f2a9c080281dea4bf88f9138dfd4087656b17c81db281b924a183
font_02_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1