PDF malware analysis — malicious · 8209845278f3b46f

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 08:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c3602d710a40ccbb443437365e38d9c9 SHA-1: 48912e8263da2c51746a2bad3b316a914b9bb62b SHA-256: 8209845278f3b46f451423efc7ddbce3ca530dc4c50b2202509d754aa99a7917

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. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress installations. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://daismene.it/file/tavaxobevukufatumep.pdf In PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797e2385f64---67825818602.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b070858688a208730b405799f9879d63/nivijamawusonasinikaxaf.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3fb4e5f92d6097d594c874f4e38ff9c9/9834336624.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160903ddae86ab---lizofurufar.pdfIn PDF document text
- http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/64085273343.pdfIn PDF document text
- https://louvre.lv/res/wysiwyg/file/19733860777.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j5so74k0kfg5t1f0qn780bpfs2/1550086208.pdfIn PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/bopemalubenilatafevemipel.pdfIn PDF document text
- http://wksystems.net/HotelEstimator/userfiles/file/sawuzefavojarofisabijig.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161280f86d5d79---17716256851.pdfIn PDF document text
- http://abwingssuffolk1.com/uploads/files/44485655255.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/3e2sd1e36evgp96k7op3qbi4fl/40491458665.pdfIn PDF document text
- http://cortabellanews.com/userimages/faluwiwupetezavevek.pdfIn PDF document text
- https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/naxoza.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d8b2033---27100790213.pdfIn PDF document text
- http://umffz21.ru/admin/ckfinder/userfiles/files/lisuduxapelalizufinada.pdfIn PDF document text
- https://biothiennam.com/media/ftp/file/kolebapisupegun.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b645eb2ec---zavorofisuzulu.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/31730950771.pdfIn PDF document text
- https://irisapp.cn/uploadfiles/fckeditor/20210517/file/16212213062601.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a3c23a90f---4777272916.pdfIn PDF document text
- https://eravukappalpalli.com/userfiles/file/xupezopefelidedonituje.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607213b1585aa---rojiwa.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e3bfefabe6a96dfb7e5f5fcbd28de574/43528753494.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/regomurefazubalepa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=16+hole+harmonica+note+layout+pdfPDF 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_off0000d4cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4CD	18360 bytes
SHA-256: `318d1267739483d587c3be0069a63b769a28431568a8ee305e0c4b3b32613afb`
`font_01_sfnt_off00010469.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10469	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011c80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C80	11056 bytes
SHA-256: `a929eb93c1e1379129a427e94ffc23e07805a055d022dd935449d16fe0b53423`

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