PDF malware analysis — malicious · d68f4b80821a19ff

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 23:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a1496ba6fcdf2109f13b1fa704fe89bf SHA-1: 12460001af0efea5971dd6865fdbd8cce9bc65a4 SHA-256: d68f4b80821a19ffec3d19032fb5efe9271bdf8a1adc1b5e0bb61983656ae0fa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, strongly indicates a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=upstream+advanced+c1+student%27s+book+answers+pdf PDF link annotation
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccdd40c9a---56209926920.pdfIn PDF document text
- http://duplisite.com/userfiles/file/50770817485.pdfIn PDF document text
- https://liur-krd.ru/userfiles/file/xoviloba.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613938b6d8faa---gedap.pdfIn PDF document text
- https://istanbularicilikfestivali.com/upload/ckfinder/files/86067252504.pdfIn PDF document text
- http://ourpreferred.com/userfiles/files/57938797252.pdfIn PDF document text
- https://dom4m.by/userfiles/files/24266473278.pdfIn PDF document text
- https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/45521277234.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nujfie29lh3od9gbe9kb59rfaj/nosebuxewomi.pdfIn PDF document text
- http://sz-nuoyi.com/Upload/file/2021090404503065933.pdfIn PDF document text
- http://cs-golfclub.com/ckupload/files/pikisijonivasasit.pdfIn PDF document text
- https://goez3.com/10005001208290177/ckfinder/userfiles/files/wiguketexeviwiwije.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613161bc44d9a---tamesizuvadus.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7be0f903---30506436598.pdfIn PDF document text
- https://1000families.eu/userfiles/file/42791686638.pdfIn PDF document text
- http://mu-rrrc.com/userfiles/file/84472443636.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/judusogumoze.pdfIn PDF document text
- http://lnianemarzenie.pl/userfiles/file/26845226245.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f9be3b1a399d0f2e3abb8e5cba85e1ff/46328801953.pdfIn PDF document text
- http://www.musicboxpiano.com/contentfiles/23564579147.pdfIn PDF document text
- http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/71643213451.pdfIn PDF document text
- https://ivanamihic.com/files/kasuzaleruxudisom.pdfIn PDF document text
- https://alkoplast.rs/files/fiwafa.pdfIn PDF document text
- http://abwmountvernon.com/uploads/files/sosixivogurujegob.pdfIn PDF document text
- https://artinterior.bg/userfiles/file/89393038157.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_off0000db59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f36b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF36B	17284 bytes
SHA-256: `09b80a0863763b6875646eae83be00adcba55f311c9513cd3c4f0b353b646179`
`font_02_sfnt_off00011fef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FEF	11220 bytes
SHA-256: `9e36daec4ae9c6be76c610099d6734f53e7ac381f82ec763dc834d7b79ca45c0`

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