PDF malware analysis — malicious · 679c40b4adaf1c18

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 16:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 16c7ded59d2d8ba78fbe772d39ca4b23 SHA-1: 1c20832bf906ef6bd10f2d081dd6933888156dfd SHA-256: 679c40b4adaf1c181a57df6b3149dd18eff1a888785f647aac4824efb70fee81

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

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 http://velapower.com/glwh/UploadFile/file/2021090519453773499.pdf In PDF document text
- http://cpviettin.com/upload/files/samujejukurenepezuf.pdfIn PDF document text
- http://ediljolli.com/userfiles/files/tuwafewazabiw.pdfIn PDF document text
- http://thanuyentea.com/ckfinder/userfiles/files/vobeluligibaf.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379c11423e4.pdfIn PDF document text
- https://jck.ro/userfiles/file/52564576361.pdfIn PDF document text
- http://jandebruijn.com/uploadimages/files/97172805620.pdfIn PDF document text
- https://pasationtravellers.com/root/FCKeditor/file/9365461518.pdfIn PDF document text
- https://dienmayminhchau.vn/uploads/news_file/48997938350.pdfIn PDF document text
- http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kewateponabez.pdfIn PDF document text
- https://wemservice.com/ckfinder/userfiles/files/fagibupe.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b82918ad3eb1e6689f560febc3441a01/sumewuxaxetamap.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d399f3584---31072530481.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca280173a---bizajewokomidufukorixe.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/69a4204a121e8fabfd75c75e30673605/38970883072.pdfIn PDF document text
- http://netichikawaya.com/userfiles/file/65885166891.pdfIn PDF document text
- http://kangmeideyiliao.com/uploadfile/file///2021090517531693.pdfIn PDF document text
- http://izmirtavla.com/upload/file/ligape.pdfIn PDF document text
- https://sherwoodchamber.org/ckfinder/userfiles/files/64057255601.pdfIn PDF document text
- https://torbay.ru/images/uploads/file/29570064675.pdfIn PDF document text
- https://sogelec-eng.com/files/ckfinder/files/futunivutaxujitig.pdfIn PDF document text
- http://plan.msu.ac.th/ckfinder/userfiles/files/62891255151.pdfIn PDF document text
- http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/rizavebuderibo.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f6c8dc9850ca4f81a61f1aac0538be45/mevekorubinebevaxumif.pdfIn PDF document text
- http://studioguatta.it/userfiles/files/20053323773.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+celebrity+ghost+stories+online+free+putlockersPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dcef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCEF	18276 bytes
SHA-256: `28326a2fc4a681c9da33223d15e5c2f75e4459ca2d0d5ff2e8173df27956d7ad`
`font_01_sfnt_off00010be6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BE6	11196 bytes
SHA-256: `cf914782dca962cff0cb9dc9acaa182e05e0222f3d822435e4f8047d5d0de0ff`
`font_02_sfnt_off000125ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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