PDF malware analysis — malicious · 20f55a71e2acffd5

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 12:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: f1ccb93a36341b434a3167038aa23a5d SHA-1: 2ae6872922fc3a84066cabeb3d75a3355f112042 SHA-256: 20f55a71e2acffd5d4bfef99dc01f3bb8141ea30a9d4b19dfca50e90dd4f0ae7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest it is designed to redirect users to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://drafthe.ru/uplcv?utm_term=neural+network+visualization PDF link annotation
- http://anhuifan.com/upload_fck/file/2021-5-8/20210508231919687753.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607021b26b9c1---90649737670.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mi2hleb6qt4u8hrgcb29q6sear/paxudubelerewe.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c3e4297ea115911d070c3443de469bcd/tagigesataritun.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e2108cba---miserepotibuvobuzawuvirad.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65766766d---vuxagavagafar.pdfIn PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/vs3eqm832jgvd3ineeue44u9r7/witudarejoravonev.pdfIn PDF document text
- https://mariellatriolo.it/public/file/xubajol.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/aed801ae16f02e6901ae835c88a579d5/9711158291.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160918396243ba---32694792031.pdfIn PDF document text
- https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/05a9df20afea932b066a81c84f3a3fb8/74951160463.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9c85c738ccabdc15c48c2f823833b73b/71833831745.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf85a3421---66672342561.pdfIn PDF document text
- https://bustotoronto.com/userfiles/file/9451894432.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160831ba9353ff---nepunomek.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a0c4e934cada1dc5a472ed4cdcb71357/dofejibutawotar.pdfIn PDF document text
- http://debden.org/userfiles/file/zumanaxaruduzowej.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732e0c0f60d---sevorisuzudanok.pdfIn PDF document text
- https://dannysacademy.com/ckfinder/userfiles/files/68619027580.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ea0696de998a5cb59ee4059110b1f667/33181797895.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ea58007ab530f2a86bbb988c9e663582/6951896362.pdfIn PDF document text
- http://fotossc.pl/_files/file/ruwifiwunuwenofemarobinuk.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a2eca726b9a187d366dce9fbf00e1454/vuwupar.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a928b11d3---91905021281.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/27f793a471fd476abe04f82d9577feab/januruxisa.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c07707c74---fobegifizisuxitejuraxafi.pdfIn PDF document text
- http://safeabortionnepal.com/userfiles/file/veduk.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_off0000f601.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF601	17624 bytes
SHA-256: `636de570e66dd6010b5371cee84ba19e584ce0c40fb0b8a1f0e9ca37f180d5ed`
`font_01_sfnt_off0001240a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1240A	10480 bytes
SHA-256: `f82fa5e02bca9a67f790868882d0af714747f0a9445d0108b7b25f58f2922f00`
`font_02_sfnt_off00013c17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C17	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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