PDF malware analysis — malicious · e4f4e514cccd2cf0

MALICIOUS

PDF

98.9 KB Created: 2021-09-08 02:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 85143f4e44e253a4523eba837061d268 SHA-1: ce41317efb2cad0775b9a9abe279799c5d219403 SHA-256: e4f4e514cccd2cf09f4e9b46649afb64a79ada466ca17ffc85c3aea459405300

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. It functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs, such as https://laborke.ru/uplcv?utm_term=xpander+gls+2019+manual. The presence of numerous links on disposable hosting suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9704

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://laborke.ru/uplcv?utm_term=xpander+gls+2019+manual PDF link annotation
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e50c4e36---nigadewod.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19afcc5e9---65902119642.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/wapemew.pdfIn PDF document text
- http://pivotal-technologies.com/userfiles/file/74621150045.pdfIn PDF document text
- http://thewellmanteam.com/userfiles/files/bojalejute.pdfIn PDF document text
- https://stiff.pl/ckfinder/userfiles/files/bipominurutajenukigel.pdfIn PDF document text
- http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1948460956.pdfIn PDF document text
- http://finemetal-cn.com/upload/files/wivuwegolorele.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f2aa76de---sokefonuwevinurodul.pdfIn PDF document text
- https://pui-vital.ro/msg_media/file/zisexomewopuli.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87879a2425---19842478419.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6a201d4b609bbaacf5add6b5c0206886/pipemomonigerosiziwabe.pdfIn PDF document text
- https://yptea.com/data/fckeditor/files/42021728998.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6255a7f692---18045825786.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/98554656523.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161269d579d8d9---54656278655.pdfIn PDF document text
- http://aaas.handyfriendship.com/upload/files/baxuwifilafogego.pdfIn PDF document text
- http://mazdooradda.com/userfiles/file/pefotu.pdfIn PDF document text
- https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/db373224a76d5b5c0ea21d8dbfd435df/86046837999.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/kabirabiniloged.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f25c0972c---fazujofepesagutapuzize.pdfIn PDF document text
- http://christopherdallo.com/file/vunedowedejakikujugara.pdfIn PDF document text
- http://globalroomplus.com/bot/ckfinder/uf/files/fowuwu.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde5d652b4---29333995406.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d90fe5011f---90957073983.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5fc2d82749644f690a1ccf00594f818e/19727380143.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off0001618b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1618B	18224 bytes
SHA-256: `21108830f7198d5f727a323d84b0e0d6d92371f11c84bcc830658cc4678cb276`
`font_00_sfnt_off000100f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100F5	10996 bytes
SHA-256: `cf424beaebe0d92e476cf1940b6cda436f920f8d5320f24e131fb7450ad7b229`
`font_01_sfnt_off00011a52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A52	18232 bytes
SHA-256: `99f896f88e42d61663734499fca38d93c1c2b61f1d61c8997e635ce8a32ac481`
`font_02_sfnt_off0001497a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1497A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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