PDF malware analysis — malicious · da23a983e6539223

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 11:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: fc20d084ce132a1d1f6b59a3f97b8f79 SHA-1: 634908cfb054195bc5830c9a36870e9805e6f7b2 SHA-256: da23a983e6539223483fcf744bac84a566ade5d7e2a6c622aad93d611dd7fbb0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, often disguised as file uploads, and uses 'utm_term' parameters suggesting a phishing or scam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing activities.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=mobile+legends+mod+apk PDF link annotation
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdfIn PDF document text
- http://ytbozhuo.com/upload/file/07233219821.pdfIn PDF document text
- https://harkakotony.hu/UserFiles/file/74095344285.pdfIn PDF document text
- http://farmina.ru/uploads/files/43734006257.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5o21qkvkbtdvq41b7vmufj606r/zunizudavufonilonupinitok.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ee4c3cd6---99784236691.pdfIn PDF document text
- http://epwuae.com/userfiles/file/37594568181.pdfIn PDF document text
- http://tele-klass.ru/i/upload/files/depojev.pdfIn PDF document text
- https://giolog.biz/images/bulk_images/files/86914605567.pdfIn PDF document text
- http://thienminhgroup.com/uploads/userfiles/file/46090169457.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9519ebe0---purifitiduxukizo.pdfIn PDF document text
- https://guineaservicesproviders.com/gsp/files/76867393337.pdfIn PDF document text
- http://zhxndl.com/uploadfiles/files/92544365090.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146660684d11---nipuvewepekefawer.pdfIn PDF document text
- https://wanna-drive.nl/files/File/zaxufiledewipifezoger.pdfIn PDF document text
- http://energy-labels.nl/userfiles/file/dezeko.pdfIn PDF document text
- http://eko-inwest.eu/upload/file/gozufujavikipuj.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f220127115756d2c3b0126b7f73d1575/89094172413.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614386563e764---zekubivij.pdfIn PDF document text
- https://muzeumkonstancina.pl/attachments/file/wanewivevinakegatalug.pdfIn PDF document text
- https://odlingfamily.com/userfiles/file/29671242195.pdfIn PDF document text
- http://manpukuorder.com/uploads/files/gepimegojex.pdfIn PDF document text
- http://studionegro.net/userfiles/files/30948765316.pdfIn PDF document text
- https://castilloexterior.org/ckfinder/userfiles/files/31615498604.pdfIn PDF document text
- https://polymadeniyaglar.com/fckeditor/userfiles/file/vinojuzu.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c55ee001f7548f8ba41944ac48e2569f/4553411756.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_off0000c735.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC735	10764 bytes
SHA-256: `c7ccf30b72248de170ac82f2519736354d6fc3ec54d685324c57720ea81288e8`
`font_01_sfnt_off0000df7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f78c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF78C	17832 bytes
SHA-256: `331b071c45e006e0ccacba8eb6ab9b801249d29858691bbd45425524295970e0`

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