PDF malware analysis — malicious · 251591c530fa18a2

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 94ee2a71aea3ff6bcd34cef6b1d3a16c SHA-1: c0d8a0e4cb6ae4ade2b877da663fc515c2c35788 SHA-256: 251591c530fa18a2e51cec1d15f5c74a3836b2eb7fdd2b3192f468a452bec797

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of numerous unknown URLs indicates potential redirection to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://bakoca.hu/files/file/kikofare.pdf In PDF document text
- http://silver.jo/ckfinder/blanc/files/tosaz.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1917246530---sizeno.pdfIn PDF document text
- https://fcr-fomentoconsumoerenda.com/uploads/files/75209797667.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609203668e5e5---nujebeneruvaguzi.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5620311daf---54015345922.pdfIn PDF document text
- http://sumterhigh89.com/clients/863574/File/55826514349.pdfIn PDF document text
- https://gomaihoa.net/upload/files/bodowariton.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/77966915587.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/v77vkrmodg47hknr8ludcv1i47/77289169921.pdfIn PDF document text
- http://renovator.cz/files/file/xezelakeminireraneduwud.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2a2efa7273380a3ac4be01ef5a949a07/dodibefogoxorebavobusad.pdfIn PDF document text
- https://steammining.com/userfiles/file/duzitulakebujotab.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cf020ffc---91014378429.pdfIn PDF document text
- http://santamariamikado.com/uploads/files/35969557845.pdfIn PDF document text
- http://asupuro.com/user_data/image//file/44190048395.pdfIn PDF document text
- https://coluer.ir/documents/file/22463121005.pdfIn PDF document text
- http://aal.tw/uploads/htmlupload/files/33857385739.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d07200a5c---11103551865.pdfIn PDF document text
- https://glearningsolutions.com/userfiles/files/pawotikutuwagunidopisap.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bed9e85f1---24932330830.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757e39ab72c---jufiguxaxit.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d8a858c1---58050358925.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0012933439a7185fe39716c52a66116/zotoxetagisubef.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6da0ad49---27002489675.pdfIn PDF document text
- https://smilepaper.tw/archive/upload/files/32718857563.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=criminal+law+australia+pdfPDF 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_off0000d939.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD939	17416 bytes
SHA-256: `933648786ff45f74366f4c096a61c8df41aef2c0e9a1ff2bd874ca7338d1e49a`
`font_01_sfnt_off00010633.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10633	10624 bytes
SHA-256: `67d1294493683b3171c9eb8aca7b534aad88fad2955d0817bf4f663759a0a96a`
`font_02_sfnt_off00011e88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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