PDF malware analysis — malicious · dec03ca7b411ea91

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 13:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 3d112d7a7565415011c509fb8ac033d2 SHA-1: de49f2abe3dce81b8f2c3b9c35f96ce82c57201e SHA-256: dec03ca7b411ea91e46372974cfc3e54b39cc7fd046d29e59579b29d6b1dcc87

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest an attempt to direct users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 5

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://bangprice.combangprice.com/beta/cms_image/file/kivejosibazedako.pdf In PDF document text
- http://spl-designs.com/ckfinder/userfiles/files/telorinuzula.pdfIn PDF document text
- http://midel.me/userfiles/file/kutatagaf.pdfIn PDF document text
- http://bundoreh.com/fckeditor/files/file/14797510669.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c4413221---85775501149.pdfIn PDF document text
- http://rld-carbon.ru/file/zulasegokujizebolorevi.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05ae9b2ebb7654a68f75c0def6a0c212/nupajasiledalimegojob.pdfIn PDF document text
- http://strategie-online.net/catalogue_dynamique/file/62554332958.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/hi2aj0oemuuv0kjan0g49l5hqn/31040611454.pdfIn PDF document text
- http://jatyn.cn/upfiles/202106/file/1623060176.pdfIn PDF document text
- http://splogservice.ru/content/file/mitumadosoxo.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tvcsfqlimie1q4m463b4qdnr55/63423182868.pdfIn PDF document text
- https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/njdc2me1fap61op4snksboimr7/vusujokifenomixizaderufu.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/74388710443.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b1f9bc46---18526982392.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecc34e84a---fepevibuzugesumilegubutu.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f600c3aa0e---jodotok.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3b2719d0eb7f36e4d28a1bc89225a609/tojiname.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e019968806---97689842347.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/937cb89c419ec3383ae57f45ea6c8365/diwunulof.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608316af07bb8---48363569394.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/903c7f2ef9b1e937f424a05119eb34d6/ravomizakasoj.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e73cf895---55698151962.pdfIn PDF document text
- http://kxnjl.com/userfiles/files/40952841209.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd15cb35e---76686989781.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/uav5isopgmug935epnerb2kokh/75621948935.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/dezelojijenuworufeja.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=th11+war+base+without+eagle+artilleryPDF 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_off0000f6a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6A5	16624 bytes
SHA-256: `8fbf7f5d5aaa4f96119b64fd37839a6ee09633191b38839326091a78c360f802`
`font_01_sfnt_off0001214d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1214D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013964.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13964	10740 bytes
SHA-256: `224269813dbfcb4d8efc56ccd751e2cc289e11a3a5289cf75b11d9edc5fad868`

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