PDF malware analysis — malicious · c70e88ac94630e8b

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 07:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 01f6ab2a669e01fdedeb8389bc603a41 SHA-1: fa16b03323675071409a04639dda47e7f19b0b17 SHA-256: c70e88ac94630e8b97c4b4cb4f7d7fcf78f7854dcb0ad3815f18bedcd8681bbe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://gartenmessebau.de/uploads/files/57022785313.pdf In PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/mikutozutedinanep.pdfIn PDF document text
- http://zkojicin.cz/userfiles/file/56294900784.pdfIn PDF document text
- http://trieuduong.com/images/Download/nujilawuvevurerawu.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614933c2ea50f---56562193662.pdfIn PDF document text
- https://cailux.lu/userfiles/files/6282031055.pdfIn PDF document text
- http://nktrading.qa/file/files/95083855952.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/13171696292.pdfIn PDF document text
- http://1666-3668.com/attach/userfiles/file/refatajegewatuwipunuza.pdfIn PDF document text
- http://poptheme.cn/uploadfile/files/20210919_211257.pdfIn PDF document text
- http://safeabortionnepal.com/userfiles/file/8487140897.pdfIn PDF document text
- http://videotour24.com/data/fckupload/file/47665828248.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594481498b---36013618619.pdfIn PDF document text
- http://eurogeographyjournal.eu/admin/fckfiles/file/xomevezigurifokelu.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d73b297---molasazupa.pdfIn PDF document text
- http://idealhca.com/admin/images/file/40695654418.pdfIn PDF document text
- http://wjcopy.com/upload/files/nakajarusoremakuvo.pdfIn PDF document text
- http://nocleginaplus.pl/uploads/userfiles/files/35439507711.pdfIn PDF document text
- http://civicwomen.com/ckfiles/files/72475996263.pdfIn PDF document text
- https://www.tahitotfalu.hu/ckfinder/userfiles/files/kogofosujitibe.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161329fa9d47f7---28393184816.pdfIn PDF document text
- http://lindendirect.com/ckfinder/userfiles/files/gelivalefa.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b98830d28---88264364957.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/35934633181.pdfIn PDF document text
- http://xn--3e0b556bhrbowi6undva.com/ckupload/files/netefes.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=automatic+control+systems+kuo+10th+edition+pdf+free+downloadPDF 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_off0000e488.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE488	11432 bytes
SHA-256: `01358f2ca123f5eab4c7b381564c77c0d5dd55bbd6fccd0a7309b1bb455f942d`
`font_01_sfnt_off0000ff77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11789	18088 bytes
SHA-256: `2c3ad93cc6eb5e8f90e1f4bb9b4ec0ead611e6b11053e5a173e9ddb0ebcfa229`

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