Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec6328f0ff0d511…

MALICIOUS

PDF

96.2 KB Created: 2021-09-01 15:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b532ea0480e1fa358050c0738e34ab5e SHA-1: af96cfdd25125d738eb926b913685f612cf23b7b SHA-256: bec6328f0ff0d51127aab50623355ee1f89c95ef4ed68ef5e188fe22e7bdcbb4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5cfcaa49647684a5ebb770b4ccbd1eb6/xojuj.pdf In PDF document text
    • http://www.tomasjelinek.com/img/pub/file/73324287578.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b29be870---geroratarufupufuxutuzafav.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/23074742777.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/jexojonatamof.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c0e744cd---lirovu.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/29518248190.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/28869491900.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/pirifapemoseluzetomufaz.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/74405843514.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/nowom.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5224997a5---89579157519.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/tepiligepekolaki.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gejakofatumidumosareruru.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vejusojibetewonefo.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/xeponosapulexafovusi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ede83e7b---xekakuza.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1626097121.pdfIn PDF document text
    • http://lachina.cn/upload/file/kefidadudasipiro.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vofemozedemowivo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fb5204bf124714d0b01698473d79ae68/91021429594.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/42197858534.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210703_39FB7F89A4982EDC.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/383a26b84665db5d6f1404b503ed2d45/38779648383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=parody+meaning+in+literaturePDF 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_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10640 bytes
SHA-256: cf09f54e8db84474b54ec9484113cb893b9cd9d826e5fc2b6b35e4ef0df928d9
font_01_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 19844 bytes
SHA-256: 3992c93de961243c938669e9b380773221b430815798f0c4a1b47458605c82d4
font_02_sfnt_off00015ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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