PDF malware analysis — malicious · 23a6535a2639c378

MALICIOUS

PDF

103.1 KB Created: 2021-06-27 02:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: d1f93c85dcab636ee50c6713832be400 SHA-1: c2cbfd24c98dfa9cf2fa529fb01bd6d579a183b2 SHA-256: 23a6535a2639c37806c8c107cfd0371c183f26f6702c47dd0f6ca1ea0af08ad4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9926

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://synerhu.ru/uplcv?utm_term=scout+finch+character+analysis PDF link annotation
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813ae90ed4---37483798703.pdfIn PDF document text
- http://beergolfers.com/blog/images/file/6009890761.pdfIn PDF document text
- https://studiopros.com/userfiles/file/In PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b76b1a00---2198453764.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c7a4b2a40edadb57feb12406cfe29e8/65843749016.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98e8c5ab0---63476096805.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609841ca933ff---56391649137.pdfIn PDF document text
- http://ongnuocdenhat.com/upload/files/fanudemiwuredidonojabez.pdfIn PDF document text
- http://legalinet.eu/userfiles/files/90613320595.pdfIn PDF document text
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/20046317418.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9baf81a329109976e29e89c4700ace17/xuderunemumuke.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a175c60cdaa2c75ced75147c61c65b8/8730853237.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2a9a3584---31708428751.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/97907419355.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/81d0665adb31848af4b66a0865e52345/vabiveneru.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ac7583b1b8f86cebac3c0553fa060878/5917477695.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f8e2d29947e4527330f2da2d25b03416/46372790196.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce08efaa2f4---41460681835.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/69475767040.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe05936c1---kaxefixorukilalodevokaf.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/19e5ae8af3e0bff6d4ce585acfdb489f/79435990896.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b40ab5d---49277161285.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f2aa90cef1d69c760438c5a736a32fd6/82903719982.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o963sb6q0fpq3johlscim8kcl3/giline.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_off000132ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132EA	16812 bytes
SHA-256: `c1de6255b9af7d61db68a91749a3f78d0257f0de616f17a1d07bd6ad6cb4ee0f`
`font_01_sfnt_off00015e82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E82	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00017699.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17699	10720 bytes
SHA-256: `1496249bf6170596e0cfa66146cb87aa04adccfe5244c0a9c462d21b7f268899`

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