PDF malware analysis — malicious · 6718f1e2b2c428dc

MALICIOUS

PDF

82.4 KB Created: 2021-06-29 07:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 655addb48ee6f6f111649bee272837b9 SHA-1: 4ac1daa64ba68d93f3be27db5478fe44a7f52ba4 SHA-256: 6718f1e2b2c428dca8b49a839159eee448f935aa69a8dc397081e99dcb7a53c1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=lord+of+the+rings+sound PDF link annotation
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/391b34aa179f20f61ec5e67e56fd9971/kofevoxikusuluronofokuzo.pdfIn PDF document text
- http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/hats89bk57po3n7q2n4gppbq0p/5047866783.pdfIn PDF document text
- http://stellarvvv.ru/ckfinder/userfiles/files/zidedujofesosewepevazez.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/pazopiwivefizofedegowizi.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b1805d53f28---rediruj.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/gi8qfst314ed07fnfm2dsbvhq6/tefibakobodutelosidi.pdfIn PDF document text
- http://nedirajtebosnu.net/userfiles/file/1734983893.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c70989506---6471494474.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c059963006b---74877384799.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2686df871---83440207169.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094f94286076---19869813154.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccb7329b1---wotevitolevonezok.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bjtvcgap4f4f31kapa7lmmco96/fimetufukoj.pdfIn PDF document text
- http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sobebotexedigafubawero.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083416445d0f---tinubezalikegidi.pdfIn PDF document text
- http://arcdesantmarti.com/biocop/Images/images-editor/file/44377200263.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9832e12a16---buwunuvafesamim.pdfIn PDF document text
- http://kythuatviet.vn/uploads/userfiles/file/51967232885.pdfIn PDF document text
- http://wagnerpc.com/userfiles/files/87607875168.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85b6d7ed0f---13139218113.pdfIn PDF document text
- http://creptiles.dk/userfiles/file/witidipanuximilifexuzora.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083951c975fa---72532985659.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0c5ab7891d72a3df84fd9d31da0acd8c/14012731293.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e21ee928e---8576560640.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/25d94d3ed05238ab1ff16362f9bf612f/bawukun.pdfIn PDF document text
- https://orangcar.com/app/webroot/upload/files/87111091172.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_off0000df8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF8D	10480 bytes
SHA-256: `0d0d6d2039d17429e646201d0d44222cdd78f47d178f7066b7b4048ddd187e80`
`font_01_sfnt_off0000f716.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF716	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F28	17320 bytes
SHA-256: `255bbb8f648e1bd3514c2425fcb25b67bd914269d048d4e8de97081540ae3951`

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