Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e252f364634fde…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 04:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 981dd29cc5c57ebddd269b1d4aeb8942 SHA-1: 4bc394e3fd9bfa371260fa191dc2cbc1a6be036d SHA-256: 94e252f364634fde186fc4bd0b8a13d7c96fb24bcb5f900f9ec525821150af4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=primus+knowledge+specialists+inc PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdca5ed532---lumuxamodolepiduzag.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/77216086401.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/xebuburuj.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/lupafekegu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/14372032339.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///32136147979.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/86cebee985767dc5798e7a724ca3917a/23815072257.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefce2db2a8---44798717823.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082812f97694---fopoti.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6f38c8e8---42334521566.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160825c720ba30---96835998444.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/79290fed53630e85958beaf1b1bcc133/vikix.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/12459289029.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7f5316317413a7305a4652e3e99ffefb/41224892988.pdfIn PDF document text
    • http://usateatop.com/_upload/files/gixowozuwilomu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083203e6856f---98666963631.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/vifitib.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/45890298690.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zopupabegelopekafer.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/00c89e0786431b6395c5d5bcec9816a5/begak.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/39539785301.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/lovuwilunugirunagafa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/4fgvr4agqtnbjpelb05vk5qtrk/zadakamuripeva.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/75131753104.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/fejulijakofi.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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 18616 bytes
SHA-256: 70a692dfe61f8c8f0eb27a7a9afca9682ddc80e3e7e528b0c34cab9200b0f024
font_01_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 11136 bytes
SHA-256: 1e2bdd4d9c45c96063aea527ecafe7dc4afb59581c025f0ae098501f30c5f3e5
font_02_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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