PDF malware analysis — malicious · a863424ab3ff49ac

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 19:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: f27d20746f1ed90d8b651e9d097f3279 SHA-1: fa5bd6a42bcb7c4e1a55afe6d66912c260e31545 SHA-256: a863424ab3ff49ac2acdc864ab63a1058b2685b207a5ace7eb0a4bfbc5432f27

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS uploads or disposable domains. These links likely serve to redirect the user to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://profession-your-dr.com/uploads/files/202109060937052032.pdf In PDF document text
- http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45749907202.pdfIn PDF document text
- http://lejonhund.com/upload/vutifisupevanogafi.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c185d11cf---6750640457.pdfIn PDF document text
- http://gensugroup.com/upload/files/wiluzufuwoladiko.pdfIn PDF document text
- http://majorpropertygroup.com/userfiles/files/8519122835.pdfIn PDF document text
- https://atvatextile.com/upload/ckfinder/files/vuxubofok.pdfIn PDF document text
- https://cylinder96.ru/admin/ckfinder/userfiles/files/wasexesivazew.pdfIn PDF document text
- http://roocenter.ru/upload/file/36545548910.pdfIn PDF document text
- http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902233531229408.pdfIn PDF document text
- http://dalaichau.com/files/darutizudorilexavivuvexut.pdfIn PDF document text
- http://dulwichtaxi.com/survey/userfiles/files/3550908513.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/gizasawudidurizojasuzezew.pdfIn PDF document text
- http://epoptavky.com/is/images/FCKeditor/File/98336417658.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ec92f0f6e923099a44948a80a4048a25/76513439858.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c85f5b88bb112e8e0b7afa134dfabb71/jaxot.pdfIn PDF document text
- http://prtourusa.com/FileData/ckfinder/files/20210903_EEA2BC9941F4297E.pdfIn PDF document text
- http://zehanbiopharma.com/upload/files/pulefugisa.pdfIn PDF document text
- http://comlark.ru/userfiles/files/tupef.pdfIn PDF document text
- https://vilus.cz/userfiles/file/98449356196.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613170b80ca8c---razukesumabatu.pdfIn PDF document text
- http://abwmercury.com/uploads/files/patijoxafexuxapoj.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/66461123752.pdfIn PDF document text
- https://askisan.com/upload/ckfinder/files/fobutowamude.pdfIn PDF document text
- https://5udua.com/contents/files/7979327585.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301bcb08bde---jojilitafud.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adb+push+syntaxPDF 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_off0000dfe1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFE1	17736 bytes
SHA-256: `2f443ce6121d623ed64cfe58c41f59f174a713fb9f6f909f8ffb1e6edf020ff5`
`font_01_sfnt_off00010e53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E53	10436 bytes
SHA-256: `5bbaed49af611d26b91d7c6295e0efe97061b0347d759acde7e224c018ea0b61`
`font_02_sfnt_off000125bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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