PDF malware analysis — malicious · eaa7bffce7082e7a

MALICIOUS

PDF

67.0 KB Created: 2021-09-30 16:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 2b7a522216549d9a42aec41d7106880f SHA-1: 964fd3b2eff760974ee9eb6a3155b8ba8ed610a1 SHA-256: eaa7bffce7082e7a8dbdd5fb6904c51289fe8a1aec05df59267993ff55a9c89c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external malicious content, likely via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.6228

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://cructi.ru/uplcv?utm_term=how+to+patch+gba+roms+on+android PDF link annotation
- http://soundspace.eu/Upload/file/bunoxezuxudug.pdfIn PDF document text
- http://noahmission.org/dataroom/file/44755284619.pdfIn PDF document text
- https://asztromiskolc.hu/ckfinder/userfiles/files/31180901693.pdfIn PDF document text
- https://laptopserwis.com/app/webroot/media/files/sebuvozuso.pdfIn PDF document text
- https://bloc-immo.com/images/83479806972.pdfIn PDF document text
- http://doradcyprawni.com/images/pliki/50355400105.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/9676018975.pdfIn PDF document text
- https://nucamsa.es/userfiles/files/54533185192.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151312184954---12333575971.pdfIn PDF document text
- http://birzebbugastpetersfc.com/files/file/42141719644.pdfIn PDF document text
- http://baikalspring.ru/ckfinder/userfiles/files/22409024817.pdfIn PDF document text
- http://uniontsg96.ru/admin/ckfinder/userfiles/files/83966287800.pdfIn PDF document text
- https://fier-forjat-valimet.ro/ckfinder/userfiles/files/50084607951.pdfIn PDF document text
- https://ofcourselc.com/admin/uploadsfile/49412118793.pdfIn PDF document text
- https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/sakifakolikewot.pdfIn PDF document text
- https://esportenerd.com/app/webroot/ckfinder/userfiles/files/libilalonuzu.pdfIn PDF document text
- http://murielbellhomes.com/userfiles/files/18195399728.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142265f21fff---resal.pdfIn PDF document text
- http://himalayakebab.com/shipinc/userfiles/files/18688734600.pdfIn PDF document text
- https://hidropomp2008.com/uploads/userfiles/file/34612358863.pdfIn PDF document text
- http://gazosilikatnn.ru/uploads/files/75912580984.pdfIn PDF document text
- http://www.chp.pl/ckfinder/userfiles/files/43835758326.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146699a640a7---36046639122.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e537b8d23a---libolepub.pdfIn 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_off0000b158.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB158	14740 bytes
SHA-256: `f5c6d2d39c4004e716d32d22c7473a57d488afa25afe8102b8b61ddef0bc64a0`
`font_01_sfnt_off0000d6b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6B5	11000 bytes
SHA-256: `e6665752c2265425f7244caddf69c706facde1ffbde1817f7fd3edb41a048c9c`
`font_02_sfnt_off0000efb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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