PDF malware analysis — malicious · 669c3e3fc4e58ee5

MALICIOUS

PDF

86.9 KB Created: 2021-07-19 15:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a1e57db8303d56c6d51c3371bfb99b1f SHA-1: b5a4d8d83b376919998aebc06f6b59fc56dd5bb3 SHA-256: 669c3e3fc4e58ee5bc30a27afc87a288a8046674fa676ea04570d5aa1a7f1605

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers to execute their payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16220646360864.pdf In PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b57a84c0---miwugokapumid.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7842a7ec---91440724235.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rp9gmfdqdevb1v5qjcsniiqk06/pikixivudo.pdfIn PDF document text
- https://selispin.com/calisma2/files/uploads/xokenakemu.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/22433424938.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/57b479bfd7d2bb92db602451e87733a6/difomokedugemuforuvelu.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb490cb9c9---mimem.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ukmkvkmhrp3jp9me6dlnl1mbgv/19412031865.pdfIn PDF document text
- http://riversedgefm.com/files/file/67893824167.pdfIn PDF document text
- http://ks4073.com/file_media/file_image/file/folevepox.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t0oibe9nsk00bkiru4el08h5dt/70413612424.pdfIn PDF document text
- https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d89cae26---jedokinalopov.pdfIn PDF document text
- http://aeronautike.com/userfiles/file/zujidijuwenoxowexefugowid.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/92de1564b578d1d7f28b1fdd47994b73/bijifun.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda4488a04c---lijukovofusefep.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625ebd82b1---32920531223.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4320a58a---wisati.pdfIn PDF document text
- https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/68883998516.pdfIn PDF document text
- http://zulassungsservice4you.de/bilder/file/92305872291.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iapnp56imkokcq4jf5cngkd4bs/88494000046.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dd944fe9775c83f890bb121481a2ed74/moterugizewezix.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92df9b956---71530196519.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/50662362be8d75db6bcde7f70a368438/38080059518.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3280d3067---44733479941.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a1ce600b449beada5a6025836f8c1d74/98660767870.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f81ee7e1---pomuvizoxomuwalamis.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ccnp+route+6.0+instructor+lab+manualPDF 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_off0000ecac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECAC	11164 bytes
SHA-256: `66e6a830a40c6fecfcfcf5808c6892e9bb64c062f08458a2b9fdbc7b746b93ba`
`font_01_sfnt_off00010683.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10683	17920 bytes
SHA-256: `240c3f8e6c91b8fb43d38757b0680cdcc3ceaf5201c9a58c3c54d9ad79479e1b`
`font_02_sfnt_off000135cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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