PDF malware analysis — malicious · d23fc5043f759388

MALICIOUS

PDF

99.3 KB Created: 2021-07-06 00:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: c1ad3eb9748cb62d87dddacd929d041c SHA-1: b8ef85bc409e424476f198ac48732cf91afb2e9c SHA-256: d23fc5043f759388f212c674c3908a968d3995bbacae6e7fe24d47f84e7bac9e

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 links, many pointing to compromised WordPress sites, suggesting a phishing or link farm attack pattern. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://huntic.ru/uplcv?utm_term=temporal+connectives+list PDF link annotation
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e4673423d1bdea99cfa7ca4d674b1f74/bijama.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/185da2505dbb12ea02abddedf556caf3/9377079718.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfc70bb46---nezowazirosikamutijobum.pdfIn PDF document text
- http://allg-gyn.ch/userfiles/file/70745068770.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5a593766---sedasatomomupaduvoke.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e02918f8a6bd338adaf0e79bcd457299/97199958241.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a353febb03b---pidetuma.pdfIn PDF document text
- http://twothirdsmajority.us/clients/38522/File/janazigatapabelekibebu.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e17140e6---pobukenuxoru.pdfIn PDF document text
- https://wsbtitan.com/images/file/37104760639.pdfIn PDF document text
- https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9o1ubgh06aq13rsmfsl6g7f10p/99993393216.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/8093866246.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/7995209479.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0cfdcf08---kumomovirobo.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607751705f8fa---74650111914.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sbsvrle9g66b2mtdjuu7r333p7/43357209286.pdfIn PDF document text
- https://termoformat.md/img/files/13278891934.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f5a266e15edc9014ac327829b636a972/valemitosumogolenolu.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b3570e560d75d06c06611417be0a258c/mekawo.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab765518853---zafogeda.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0c40e885---lazenofe.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/i9nbulllk3c6nkaopa2ni0umn0/fenewuxukoxesukevenare.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ff58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF58	22692 bytes
SHA-256: `ce3a349ec0072e8fca4713f799affc8945b77ccd1d4d0415a7b1a8b1c550906f`
`font_01_sfnt_off00013a0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A0C	10564 bytes
SHA-256: `d840c43ef4a37ab5bbee0f0e369f8307ad97c76e70d02081f283714528b64ecf`
`font_02_sfnt_off00015227.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15227	16128 bytes
SHA-256: `3c78989101cb06b0ca1b4c535d8d88f000bf2c2f20420eb2c28298c0ca4e826f`
`font_03_sfnt_off00016788.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16788	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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