PDF malware analysis — malicious · 88b83217b08c75ff

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 12:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7daee832d8f4d63b9b615d5541d6f4b4 SHA-1: 30263fa8f81d9e192a481b4351c63be7bbbf5e28 SHA-256: 88b83217b08c75ffd191e19e1a11ff1b4d746247066a9349f015fd3724a0f40f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit user trust for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://infrive.ru/uplcv?utm_term=convertisseur+pdf+to+excel+online+gratuit PDF link annotation
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45f1d0dd84---wesolekowojifipewelegan.pdfIn PDF document text
- http://efuegypt.org/userfiles/file/4349039093.pdfIn PDF document text
- http://nhactheducthammy.com/upload/files/bumig.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/namipitupomumotobitad.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bef232412---lufeseloxudejetar.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47a3b9d0c---64415232713.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/71249521871.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/955f632915085a8ff4a93af3448e289d/gepit.pdfIn PDF document text
- http://greenbrier101.com/userimages/66911612941.pdfIn PDF document text
- https://www.alugutader.fr/ckfinder/userfiles/files/5307671085.pdfIn PDF document text
- http://0851gay.org/userfiles/202106file/2021061600470670554.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161334fc6594c7---dovek.pdfIn PDF document text
- https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/3b3d7defa6e890bb6a6bd53ef0c28b39/5140331505.pdfIn PDF document text
- http://coffee33.ru/archive/file/rinamidusofaxizawire.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28738ed2a2---74115989396.pdfIn PDF document text
- https://arch.ua/ckfinder/userfiles/files/11783706936.pdfIn PDF document text
- https://etcbt.com/userfiles/file/12151432592.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a507127886---nusutepuvuwuxuge.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747abf91853---98990849103.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609efedcb6326---78810878638.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/buzepubemepeje.pdfIn PDF document text
- http://skupka54.ru/upload/m/dajadug.pdfIn PDF document text
- https://gabinetpro.pl/kosmetyczka/krakow/files/291507506.pdfIn PDF document text
- http://benly-carson.com/product/files/pugib.pdfIn PDF document text
- 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_off0000d864.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD864	20860 bytes
SHA-256: `bdfa1dd03e481de6f6ef5a16f1527a4e41f978365f088adb0e8243b9fbae48dc`
`font_01_sfnt_off00010d5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D5D	11096 bytes
SHA-256: `48aae9dd9a578932d566210a335a06a863776a06844a6aed533a9a521271be73`
`font_02_sfnt_off00012742.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12742	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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