PDF malware analysis — malicious · b92de0ce6b959ce0

MALICIOUS

PDF

152.3 KB Created: 2021-07-19 14:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 4f4d4bb82c9df46c71c6e5904ff0a5e0 SHA-1: c7e7a067b58998e9d63b0df7f527f91608c47e91 SHA-256: b92de0ce6b959ce0200a0f4d1c75a6707b5cc199b97c54eb83c2db08bde03860

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farms on compromised CMS uploads strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

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.
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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f64613022---kuxifetuketibemu.pdf In PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/79907237045.pdfIn PDF document text
- http://acmemask.com/upfiles/editor/files/47956400215.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bcb1e4a6---pebadoravawofop.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9662219110---nagesijaka.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608544e2a36d4---rewivexiwa.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607584cd4651f---kidevukivoretasamiveburuk.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/80417941052.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070397dda874---xipife.pdfIn PDF document text
- http://forter.vn/hinhanh/file/35270111670.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/60457447397.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/nbu5tgdip7itrkso757i9v5he6/49168727717.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96ca075a0---87429503046.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/770964092.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ea3d820c7---11530875909.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14be54eb51---11616803652.pdfIn PDF document text
- http://apnorajasthan.net/userfiles/file/81808493766.pdfIn PDF document text
- http://getem.pl/files/file/2099261073.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf97e608fa---wevariladetivizi.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b8b8526271bce261374902b850587a8d/226427597.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e0lta0t8163m98ak233qfdpmcl/kibosajijelulitodepugu.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7ab61385826ff66ee7d8d1fcd3771e7c/kovasevinolidevijapufigel.pdfIn PDF document text
- https://ketdoanbus.com/webroot/img/files/kufutexasipav.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d2678ce8---56072372299.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=consumer+protection+act+mcq+with+answersPDF 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_off0001f270.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F270	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00020a87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x20A87	10956 bytes
SHA-256: `09fcd9705f477ffbae2e24e27ec8f6b1488b334d5f68852e5d47dd8d28c0b374`
`font_02_sfnt_off000223dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x223DD	17980 bytes
SHA-256: `ae937d661ff473007f96651823039c760314ddba0ea5001ad332e8f55502f716`

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