PDF malware analysis — malicious · ef6df552c40f3294

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 08:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e843a2b89b9e49c3d5c8956139faec7f SHA-1: 88da97f37d8cbf749b9fc926335b29f0cd18019d SHA-256: ef6df552c40f32942a13511d9804b2083a82339275b503438ad883aafe73b99b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/17ef4ca8dcde32fd85a2fafe94629769/kademotofitovuxa.pdf In PDF document text
- https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c10aef7b19c9fdabf5f4f9991f8a2300/73278846946.pdfIn PDF document text
- http://bukharageorgia.com/sites/default/files/file/lisezowenidifuloginilapal.pdfIn PDF document text
- http://remont-etalon.ru/upload/files/pipoxupoxup.pdfIn PDF document text
- http://stattus.com/assets/file/60356862596.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859bde4ff5---66376694277.pdfIn PDF document text
- http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed913507d0---21705478827.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b79a71a4ea7bed7e8d839090bdd7c19d/kekepap.pdfIn PDF document text
- http://tatvideo.ru/ckfinder/userfiles/files/20745494584.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc522fc64---10685952586.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4492af0f4---95749028019.pdfIn PDF document text
- https://samowar.me/upload/file/tetixoketapupewi.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e46e2044---sojakonilizemipikula.pdfIn PDF document text
- http://uptownfallschurch.com/uploads/files/62446842854.pdfIn PDF document text
- http://globalroomplus.com/bot/ckfinder/uf/files/82050976086.pdfIn PDF document text
- http://elektrostroy.kz/ckfinder/userfiles/files/41231100239.pdfIn PDF document text
- http://emurus.jp/userfiles/file/rasipolufafam.pdfIn PDF document text
- https://metricgroup.it/uploads/file/7682631489.pdfIn PDF document text
- http://mjsolankifoundation.com/fck/imagesfile/92246921099.pdfIn PDF document text
- http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/zopem.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/54511474527.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0f28d76b---38150005158.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/656862218be91cd1f6fe98416e8f5dac/26591200440.pdfIn PDF document text
- http://homearcky.nl/userfiles/file/78380318419.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9713951711---fonevivax.pdfIn PDF document text
- http://blevy.com/ckfinder/userfiles/files/20745710500.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610992508e424---65554250729.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+kill+all+mobs+in+minecraft+serverPDF 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_off0000d2a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eaba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEABA	18576 bytes
SHA-256: `07a1e9eee5b2a69dc755bc319790568a6a694f222d9072f7499630c0a2464a8b`
`font_02_sfnt_off00011b17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B17	10872 bytes
SHA-256: `559e458e1fc40bcc7c7327831ab543e6ab149fd2eb3341891245567818a5583e`

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