Malicious PDF — malware analysis report

Static analysis result for SHA-256 311a02c473a0a0aa…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 11:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f250af0a6d778d497fa0ff04e431c61a SHA-1: 5dad5754a5952c46925972011f781ee71591596b SHA-256: 311a02c473a0a0aa420a71ec5b505fa9cc3b4b9de3b15e57e5b761ab8e0015e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing a secondary payload via these links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://htapigroup3.com/contents//files/kolavesilupejeve.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b42d49f0b80c01f2380bdfa9853b7f89/47248889849.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079d241069cf---28509117587.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/81007774199.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d43c946cc0---lajebilal.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/73062a84f7784db22a12778cd0e32f12/fupamapesufumolenugolir.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc73dc645b---40974181762.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/18829928339.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f06564c5dfc6df2469da65ea52b0d584/61830400263.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a09b6c3d7---kotabivogotanuza.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/jilawatavomisatotujida.pdfIn PDF document text
    • http://lobi.md/userfiles/file/85128437492.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hb3ap27qftat68ov3dq3u2o4dlk84fri/84501722330.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/22444968451.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/luvosusemobenatazerurufu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8209c7d72f7d2d0bcf8dae5cda705879/nijaxisejuwinukivubi.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/megizikilomejekitiv.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wasoluputoba.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/pesavas.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061420570557.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/45319392118.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/venafukajonuru.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/simapozefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=listening+worksheet+for+grade+1PDF 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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10776 bytes
SHA-256: dac10f20749984376848e153004af7e5dde74bde4822c541452ddc39ddc6bbdd
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 17816 bytes
SHA-256: 88f6716253da08d6c1ac69e9f8e19d199732b9ed9a835b371ef1a645825a38a4

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