PDF malware analysis — malicious · 99e42f7fceabf1b2

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 03:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c44116ef378016b2c82f16a00892f0b4 SHA-1: 74c36a61eff2bb893b2343c88403dcf5e2b44c51 SHA-256: 99e42f7fceabf1b2dca6c43261f179db0321f07b4c5a8932422b4bc51705dab4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=konkan+railway+monsoon+time+table+2018+pdf PDF link annotation
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac91c865e7---83169125807.pdfIn PDF document text
- http://educasters.co/ckfinder/userfiles/files/4115018116.pdfIn PDF document text
- http://bettynblue.com/upload/fck_img/20210623/file/didewa.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/17a072258a8f6886c6014b5f515940bc/99646709268.pdfIn PDF document text
- http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/71b20e96a03e5594b8f300e97a834593/44753136181.pdfIn PDF document text
- http://deborahkay.com/ckfinder/userfiles/files/kaziwur.pdfIn PDF document text
- https://tramhuonghanoi.vn/upload/files/japoxogogasalejin.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/fb5676fc8cb34556a074b5f80fb03e33/98784202041.pdfIn PDF document text
- https://z87992961.com/upload/files/20210721070408.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f56fad5b2c18e6bf6922669631550744/62265806288.pdfIn PDF document text
- http://autoscuolemontagna.it/userfiles/files/lunivinodizajimikulesipuw.pdfIn PDF document text
- http://kreativitaet-stadlhofer.at/global/images/userfiles/file/54108054473.pdfIn PDF document text
- http://sns.hu/_user/file/vibiralowiwokenolaj.pdfIn PDF document text
- http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/rilonewi.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6748529b---42385596031.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117fc42c7611---jodinegiwifu.pdfIn PDF document text
- https://uudanbury.life/files/file/3448305666.pdfIn PDF document text
- http://www.truca-taoules.com//ckfinder/userfiles/files/32454350141.pdfIn PDF document text
- https://uleiuri.ro/userfiles/file/3278458388.pdfIn PDF document text
- http://unipsyclinic.com/userfiles/file/20210819152100.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1090b6c3---jelunuvidawebotut.pdfIn PDF document text
- http://dent-pro.cz/pic/file/nesojif.pdfIn PDF document text
- http://memphiscentral1969.com/clients/865565/File/96458140457.pdfIn PDF document text
- https://mgogs.com/mgfiles/file/liwodubobewu.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_off0000e755.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE755	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF67	18404 bytes
SHA-256: `6c207b153f238ce74f11afcb9066db3d4bc0dc26bcde0e7ad430c42f8866a320`
`font_02_sfnt_off00012f2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F2F	11584 bytes
SHA-256: `d56e3e1720200a450ae807d726ab7fa449d9a8d97abea27a1fb3663af869d1bf`

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