PDF malware analysis — malicious · 620c8be7a492d804

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 03:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4d04984461762957c23099f66333b4ab SHA-1: 78d3167b9274a5c968f865ee0db47379c85397eb SHA-256: 620c8be7a492d8041eed93a8dfe6674f99449d55ed5a834546be32d3c4e2e262

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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 http://anapro.com/ckfinder/userfiles/files/59879694241.pdf In PDF document text
- http://vinhhangvien.com/upload/files/tedegufus.pdfIn PDF document text
- https://serwisnawigacji.pl/userfiles/file/sozobaferopuvi.pdfIn PDF document text
- http://zae.me/datafiles/file/19043029242.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ece9ad919c4c9b04786925cd1b22aebe/81930331036.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109664f5c7a6---wasojuriroxuke.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b5634411---sezesesosetid.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc402bd2d5---bepavuvulefib.pdfIn PDF document text
- https://patoman.ro/ckfinder/userfiles/files/81741432661.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/65322117743.pdfIn PDF document text
- http://himalayakebab.com/shipinc/userfiles/files/bemapugarewup.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079423876c73---pilemisubivakawabozorir.pdfIn PDF document text
- http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/jikawoxamatifazevutudebak.pdfIn PDF document text
- http://christopherdallo.com/file/bibuxuvitopumeg.pdfIn PDF document text
- http://birizgardenhotel.com/userfiles/file/kakitipixifawibavonaf.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a6fec2c13---funajijosifulape.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tds2ink4tpdit6okeodhejee13/28658406516.pdfIn PDF document text
- http://accessoriesunlimitedinc.net/catalog/file/kasorego.pdfIn PDF document text
- https://asiantms.com/ckfinder/userfiles/files/9193890103.pdfIn PDF document text
- http://cafemsoffice.com/userfiles/files/baguwoz.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/020d09bff8a043153a22d99e02bbde95/2998622136.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47238dbdf---resefonunuxi.pdfIn PDF document text
- http://xn--80age2amlc.xn--80adxhks/pics/images/file/61459420455.pdfIn PDF document text
- http://www.grifin.sk/files/kemiwasanowoti.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=word+converting+to+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_off0000c3c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3C8	16648 bytes
SHA-256: `f0867b3ef657707274962f96de7d165e2d01e9d7694b690395a310c6d5ed1383`
`font_01_sfnt_off0000ee7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE7C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010693.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10693	10476 bytes
SHA-256: `a0e130f98682d9d6ca9f2275c190b0ac115fd6a8bad1d89eadc90ca660562510`

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