PDF malware analysis — malicious · 8e316d6fe0931726

MALICIOUS

PDF

96.2 KB Created: 2021-07-13 17:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 6bc65ffb07fb53b1a309a0e67f2b8833 SHA-1: f155670083e5bd999b0d0b2fbccfa2140a4aa88a SHA-256: 8e316d6fe0931726d93fcd9c8a17401a2d49bea20729256bec9b88f001f2b13d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to lure users into clicking these links, potentially leading to a second-stage download or exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83e5b61d2---58493685308.pdf In PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b4fe8eea---kunasozarode.pdfIn PDF document text
- https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9akimjqnb0mqcaef8fe7keo5ru/puwelun.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160761ec8bf49f---48651141996.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/biobqqi98lehd3qq3r5aqf38jq/zigerawakela.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5290e58814c453ea5e3ff8fb2f1d4a17/68466544282.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6e957f832f3e9ee7b3c41439df3407fd/80065826520.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/13c841fb6f74b9b2f4ea2d5b8f7107e8/29415783979.pdfIn PDF document text
- http://panda-es.tokyo/yamituki-n/uploads/files/xogilojujowamemezinijuzu.pdfIn PDF document text
- http://31kouqiang.com/userfiles/file/1623125742.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd749aa271e---mojunelave.pdfIn PDF document text
- https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/uj73csfiq9ga75kitb1g0cjakt/28556050091.pdfIn PDF document text
- http://monkey-do.net/userfiles/file/vonexabudumexebitil.pdfIn PDF document text
- https://giustofiori.it/file/jonoza.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077137706c37---gapufe.pdfIn PDF document text
- http://nutronicltd.com/userfiles/file/rinoxifemu.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd5b09f7c---54991432168.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10b16a439---zofebesa.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e6b8bd915225343ccfd21df9abc0f/mazikovipomezolinoker.pdfIn PDF document text
- http://soupworld.de/upload/file/mitofutufazidatezewati.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/5219267663.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5r59l5t82t9f5bkv83irsqaifi/2849343453.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/047c073b6d4738382f1f004d36363f8b/sexamejozurosakixuzov.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98f0b98b4---66825668444.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+meaning+of+torePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ecef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECEF	23076 bytes
SHA-256: `0d4b6aeb917c740a0d6597e216c3b263537fbb3c322cedb3564e732251627f95`
`font_01_sfnt_off0001288c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1288C	10412 bytes
SHA-256: `e79430a748a4c3267cbdcc68f2fd450b4ac4fd3b9088a270ac68fcb197752495`
`font_02_sfnt_off00013fe8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FE8	17128 bytes
SHA-256: `fd9ea44c1bdc2a982ccc46bf8dda6b7c42367a159128f0aa02670f92b2dbf4af`
`font_03_sfnt_off0001594d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1594D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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