PDF malware analysis — malicious · d9a8f0b7c331eba8

MALICIOUS

PDF

106.5 KB Created: 2021-07-03 07:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5a1a922847e2f529f0bc0205ecc61070 SHA-1: bb7f5e36e6bba111d59c0f56cd7c0a2733cbe74a SHA-256: d9a8f0b7c331eba87a38210f11be89e0a5159cb6d054e5980f4f4281c2a44901

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites and disposable domains, likely to lure users into downloading further malware or engaging in phishing activities. No scripts were extracted from this sample, but the presence of multiple external URIs and the compromised CMS upload link heuristic strongly suggest a malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://crewmak.ru/uplcv?utm_term=greco+roman+tradition+of+history+writing PDF link annotation
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3a47888691e52bdb7ff6338372049021/bojutifol.pdfIn PDF document text
- https://otartufo.com/ckfinder/tartufofiles/files/40010548613.pdfIn PDF document text
- http://inhome360.ru/admin/ckfinder/userfiles/files/rajitapirusan.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5775d60a4e---38462036156.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b48f0250c---ruzuzewosiloborewawig.pdfIn PDF document text
- http://goldenbaycruisesagent.com/userfiles/file/lalewubo.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/26em7bmf9hhtosp3p6ggktvai1/18610141563.pdfIn PDF document text
- http://e-kva.ru/admin/ckfinder/userfiles/files/xenanaxe.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf64ca39b---gamolusib.pdfIn PDF document text
- https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/0d6709d03f3894a024983e77dee34c93/lobegavum.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da4b7c5123320c8abc0c1527c912ffd6/23838715775.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e44b73d5cd8c1f73cc4c83c763f707cf/mowotinufojenebomurab.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/wotajimizagefuwunivip.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6u59gchtib9mupgit6jh1ks8cn/buxeporogubupejomabegepa.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/85567770030.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb3001eac---26859857578.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41e6084f9---76452517055.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b80849ca---80202834470.pdfIn PDF document text
- http://amandamaitland.com/images/file/94153894555.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e97c87cef---72102633796.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/o5gco124vpqr09vuag1bqpud9r/kunujebup.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/msemaq3dp5fbfpketevh48clog/loparibixipobulidalekir.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767849d9de1---74209244048.pdfIn PDF document text
- https://oklogistic.lv/upload/file/4714021109.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524c07b7c3---7588555232.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_off00013a7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A7E	11116 bytes
SHA-256: `85b5474a7e08eca50f1f7541431e19fa6eacb60a935bb852bb976f398171431c`
`font_01_sfnt_off0001542c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1542C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016c3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16C3E	18020 bytes
SHA-256: `805b5cdb1a70b61b27b6fe788d757acad3cfe83a39d3e9e71fcf5ab74f201f07`

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