PDF malware analysis — malicious · bdba7a3a2d5921ed

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 10:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 4291d4ebbe72de5e395200eabf912f16 SHA-1: 7e19e3703c13f7c04fe71f2447a9bf5f31d0046b SHA-256: bdba7a3a2d5921ed530216f912534764b5703c0c9f57b2f6ae7d48c6bdc867ab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=sex+cord+tumor+with+annular+tubules PDF link annotation
- https://werbemittelag.chupload/file/49565049918.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3cb7767a4f21f42b7980b45ebfe2d280/63450910763.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d33a6a74---malibufuke.pdfIn PDF document text
- https://akproauto.com/nbloom/fckuploads/file/15507660624.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed04bea62---97158504704.pdfIn PDF document text
- http://stasta.com/userfiles/file/kijesudofikaru.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fjp7jjlblhksoef004qcnho8ve/vojovazidebapezudav.pdfIn PDF document text
- https://flardochform.se/userfiles/file/5964037387.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bef4a1170---bepozivimi.pdfIn PDF document text
- http://brenna-ski.pl/userfiles/file/6152856808.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6d9ce452---vuwizijibel.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb779bb3d9---totazomudojavobopuralo.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c57677fdb2---pamevukijo.pdfIn PDF document text
- http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xowifinivuza.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/kupakaw.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3949030c51---dijujejasiwupit.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/85822906921.pdfIn PDF document text
- http://goref.ru/files/file/zetosufivokokofun.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af708033f62---tazedelawoze.pdfIn PDF document text
- http://starwindows.ie/ckfinder/userfiles/files/wakodemevadeteb.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba355516e---10834047703.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01f5c48f2---52820803944.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/2649121122.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ec74a82e56d4fb16a33bce790775e7b9/9982756094.pdfIn PDF document text
- http://naoshima-habitant.com/77551144751.pdfIn PDF document text
- http://cck-brno.cz/ckfinder/userfiles/files/29434875035.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_off0000f194.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF194	11140 bytes
SHA-256: `1bbbf6b6d2257fbf69026f3f878fee13fa2d11d4c6e154f305fd96001aba8107`
`font_01_sfnt_off00010b74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B74	17664 bytes
SHA-256: `87c11e9cefe8af011dc9d8aee971049257b09c76cf29fc339e2af3dd0b231d74`
`font_02_sfnt_off00013989.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13989	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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