Malicious PDF — malware analysis report

Static analysis result for SHA-256 8220e540b320cf7e…

MALICIOUS

PDF

97.9 KB Created: 2021-09-17 07:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31fea0062e8c9cb95562c375d9b8de1f SHA-1: b570381879482483879d1c28483ccafe56c5adb3 SHA-256: 8220e540b320cf7e60609f7267a1dd2dc7f6db852a13d2cfe330e98f1030d942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous disposable domains and compromised WordPress upload storage, suggesting it is used to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=bugs+name+list PDF link annotation
    • http://akcihlar.cz/userfiles/file/mapamusizekovapuvesodad.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/72228646776.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/15780851754.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6e01976---rikibugazinawikorisof.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/40111288972.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/latin.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109061422198779.pdfIn PDF document text
    • http://malifer.hu/upload/file/73628401463.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a469ada---50644589475.pdfIn PDF document text
    • https://badoza.net/userfiles/file/8904584117.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/murogivetupowakupewivojax.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd5b1e09f1---ronigazasezorub.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436d02b3945---85392254540.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14208947047.pdfIn PDF document text
    • https://fasleh.net/Files/files/rawedutofe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae18b9961---15193717837.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/6890958863.pdfIn PDF document text
    • http://skia22.ru/pic/file/74561456842.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/99136439577.pdfIn PDF document text
    • http://lex.tj/img/file/35496715049.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/34502778385.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/rutobiwidazadowugegifik.pdfIn PDF document text
    • http://195exim.com/datas/files/32615168642.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/89872315047.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/18171458211.pdfIn PDF document text
    • http://ledins.lv/cms/file/jitejupotejasuwepowewen.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_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 18724 bytes
SHA-256: 1ab2f7db71e4f7a8f859f9a47cb5c67be02d2fc716a71d6a906049ac05bb111c
font_01_sfnt_off00014a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A43 10384 bytes
SHA-256: 7aa1c786e57cc468fd1b02ba9a7d4affd06eb2b875d699d56754eb28e7a98d37
font_02_sfnt_off000161ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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