Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7b8cba0918fb61…

MALICIOUS

PDF

96.7 KB Created: 2021-07-24 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab073437b088a472d3dd229e86c2f226 SHA-1: 9783d9da598fb318c846dbdeca3dea00f952ed86 SHA-256: 6d7b8cba0918fb61cf83f2ff801fa1dd27a0625b0b5508950cfba288124c8255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the nature of the hosting point towards phishing or malware distribution as the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://ducthanggroup.com/webroot/img/files/sonobunepiw.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35615639ee---97598977118.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160850dd97593f---73353766830.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607daff737314---zesopezesanuvaxe.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/97189900651.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32290395---dujigimezizirokojuzemaf.pdfIn PDF document text
    • https://tsegypt.com/file/neranomaxuzowuwiripalin.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/86c62bf18c84b88d980002a92236cce7/rejikononebuwinagewewuwuk.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/35948310482.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4da09517d373225974da2c98d5bdccf1/gupobuwevowo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/3563999382.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fd38cc170---65073086909.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kokavofipabezinepufivezaf.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/nizuzalumufatakafuzi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c698fd454d122b9309ea43c2af1bf023/18337152543.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210702_02120A6C6A82BB00.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/61568411114.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/10876762885.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2238135bf5---rirekosuvasun.pdfIn PDF document text
    • https://paperland.bg/uploads/file/fojowek.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b221842afcd---53674782038.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/46044519762.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4k0ungla535bc39m13238bci0d/44035514931.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/guxobonugamuwof.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/37480335178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ong+bak+3+full+movie+in+tamil+free+download+hdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00015b0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B0D 16888 bytes
SHA-256: 65ec3de44c6767b8e65203987ef3fdcb051680f0a6e754af9a448a5e13c569ec
font_00_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11316 bytes
SHA-256: dca675ecee15d683643106affeeba6cdf944d69bd92cf8c1d8dee519c8e744fd
font_01_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 17292 bytes
SHA-256: 8e5809f7d31a9f4235375ccce9dd0e1b7cc3a8e3af9dd17d7325575e628db74f
font_02_sfnt_off000142fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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