Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ad46e82a196723…

MALICIOUS

PDF

103.5 KB Created: 2021-09-09 17:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6433cd22d36d069db087dc86fe263084 SHA-1: 0772c01a43a5ee12ba463456443368b1a75769ee SHA-256: 91ad46e82a1967237adce644d4a208aca1ca4ccbcdbcdb6bb8868221c05f518e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. ClamAV identified this as Pdf.Phishing.Trojan, and the ML classifier strongly agreed, indicating a high likelihood of malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161319252badcf---zezojatuvebovuposepejak.pdf In PDF document text
    • https://tekartltd.com/upload/files/dixutelasidovomonofuxup.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d7c215decbcc14570ca02082bc6e5b4e/28710676576.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/bejaxamol.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/bazuno.pdfIn PDF document text
    • http://a-pluset.com/userfiles/fosobamutusevulobedixi.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/19978165081.pdfIn PDF document text
    • http://tai-group.com/upload/files/34465330651.pdfIn PDF document text
    • http://modero.vn/upload/files/mugozesiguzijeburudev.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/53865625467.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mijitotixalefovoxotuzi.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/85574440221.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/64401328635.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7de2c021---buxutowibazijapade.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/wasajepinadoxexikuvupu.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nizigave.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/35657343834.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f06c8d37---60549606072.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_C6006A83B6AB948C.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/74406538092.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357eb6460ba---sujok.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/bagaxuxowuxegel.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/82137022797.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gekitib.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/pofavakuseronelovetaropi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+man+in+the+high+castle+book+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_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 11164 bytes
SHA-256: 9377984314eefd1274096c187811e5b03b31d575f97a95388a598d05c4fe1305
font_01_sfnt_off000145f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 19300 bytes
SHA-256: 6460bd84adcfc130f3f13e572933c47b264c2847e674a5a7b2aef1a1772ba133
font_02_sfnt_off000177cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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