PDF malware analysis — malicious · 975e957bee872ecb

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 07:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 732b1f64fa47c31a317462f54d27a7c2 SHA-1: 0b0566afcc009ed8aade1e9d89c737628a0fc05a SHA-256: 975e957bee872ecbec9df28ba1e44d3adf42c052b76abc101f9c4d3a5742a454

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d04f62b7acf---21053531280.pdf In PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/28b38382f925175b135e886d44864837/79097414304.pdfIn PDF document text
- http://bhttourist.com/upload/fckimagesfile/78961933466.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/703c56c3f70c64b415511f254469efad/71607442999.pdfIn PDF document text
- https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/f963869b82fe19bc114ab49c5e756b16/98295922518.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d42933a3---1444277469.pdfIn PDF document text
- http://kodemari.info/data/files/wotovusigodutasuzagogi.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5b7hgrr3s8qinjcor80tgee336/96901735738.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac518db8e---90987494620.pdfIn PDF document text
- https://fsreloading.com/userfiles/files/42051753691.pdfIn PDF document text
- http://forglass.sk/userfiles/file/4464704486.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f3f35af4---54693345636.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rjfs54v31li1faud431so2aruf/5775501780.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b82ddd61a---31907907866.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608255d1acbb2---3250726908.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b6d78b1dfb597472a480cfdc45c7df63/zolamawe.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3332f82e---najilaporimutatodu.pdfIn PDF document text
- https://pergamine.com/ckfinder/userfiles/files/71358414265.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4559e6c5e79480c781ebe47a2df556c5/dimelunimokepofuzasofir.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/59054404623.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8097afb4---72730182129.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffe09c3fb---30000766315.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+avengers+age+of+ultron+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_off0000e4b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4B1	17276 bytes
SHA-256: `8572670ecfeff312df12b96ec6c3257d963b431cc25565bcc0a0f838a2eef4e7`
`font_01_sfnt_off00011231.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11231	10756 bytes
SHA-256: `8da02c11855a877f25c323eb9c0e6261de25f67c28ecca01206bf1661b1747bd`
`font_02_sfnt_off00012acc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ACC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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