PDF malware analysis — malicious · 464b8c45052f42b1

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 03:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 3360e4f5af0ee1342ec3dabe15d72c46 SHA-1: 8ae403dbb878e19675a880447163b3ac3c260c10 SHA-256: 464b8c45052f42b1a8956fb55477f5ae1c389b80a4912a800c7a95b117bc7d8b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of the document.

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 https://laborke.ru/uplcv?utm_term=gate+exam+sample+question+papers+wa PDF link annotation
- https://isabellepieman.com/userfiles/file/2413056.pdfIn PDF document text
- https://silverlabpupsforsale.com/userfiles/files/kazutajovad.pdfIn PDF document text
- https://egyediajandekotletek.hu/mvc/userfiles/file/segikekawuwisevokuxo.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rjkatsasmtom89eu9tnt78navt/49500209514.pdfIn PDF document text
- http://mprime.net/ckfinder/userfiles/files/xaloroturasebirura.pdfIn PDF document text
- https://bucatariizidite.ro/printuri-fi/files/zixizidalesumesepoduguj.pdfIn PDF document text
- http://www.smartusb.info/images/library/File/jeporatiwemigusineruxigav.pdfIn PDF document text
- http://idealhca.com/admin/images/file/jipumebibuvibotaxikadiga.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e64dc392fd1477b37a8b6e1e5ae36f03/vipisotiwexobefug.pdfIn PDF document text
- http://wwstationery.com/files/file/lubewajazil.pdfIn PDF document text
- http://ibrahimalsada.com/pics/file/tebugar.pdfIn PDF document text
- http://hnsunnyfood.com/d/files/zaferexobofawisotipibuk.pdfIn PDF document text
- http://xn--eyt274i.com/upload/files/datorunapajekaluvubusi.pdfIn PDF document text
- http://dobermanncz.eu/files/siparakipuvizadokas.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5aaeafe67---64581229406.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b9c34b0---momijivotopav.pdfIn PDF document text
- https://istruttorecinofilo.it/userfiles/file/83057046535.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc5386de1---93998850212.pdfIn PDF document text
- http://esenkardeslerinsaat.com/resimlerfiles/batokadujodo.pdfIn PDF document text
- http://mptech.vn/ckfinder/userfiles/files/nonelidimuwonafatiju.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fbd26b71decad8c3a760133d4bac937a/58182658531.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6b2762b1337f3499c6cfe8780fa191ed/gakamu.pdfIn PDF document text
- http://sipzip.com/userfiles/file/lifurama.pdfIn PDF document text
- https://abctranslink.com/ckfinder/userfiles/files/83184362826.pdfIn PDF document text
- http://chinawin-consult.com/userfiles/wugigesikulimidisit.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.info/upload/files/lobupaditimujiferaw.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7EF	18280 bytes
SHA-256: `0e966045c6e2cb519eb9355181a56d6b045addc535b26edff4dd8d3f133a3fc8`
`font_01_sfnt_off00010704.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10704	10888 bytes
SHA-256: `28523811a08d13bb0cfe7a8b2f1b3822e23ca2fedeb05bcf9e663e5e6d1ac358`
`font_02_sfnt_off0001203d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1203D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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