PDF malware analysis — malicious · e88d65274721ed3e

MALICIOUS

PDF

81.3 KB Created: 2021-08-18 12:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: a8c0884e33c09af7d1536cb085443ceb SHA-1: 66b889938601c89f663d4b7e24fc1e32295fb88e SHA-256: e88d65274721ed3e8478a7ff832999e93b2a7932505dcd313641c20c8e39880d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution attempt. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be acting as a lure to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=baixar+atube+catcher+atualizado+gratis PDF link annotation
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/e85ec4f9ee996cd2824463c0d9c1f396/bunaniwus.pdfIn PDF document text
- https://quanghuydulich.vn/img_duhoc/files/80201301788.pdfIn PDF document text
- http://hani-bee.com/userfiles/files/92739025795.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/06603ho3e5qapjbffgict08q34/namavovubebe.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf127d563e---5163438567.pdfIn PDF document text
- https://perfecthospital.net/FCKeditor/file/zimirobaduzusefolaga.pdfIn PDF document text
- http://sgyscom.com/upload_fck/file/2021-8-13/20210813041001735164.pdfIn PDF document text
- http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/sukaxog.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c7dc981b1096064db0f99825fe0d9db7/tawimesitikilitikovosixug.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611912f6f3ca4---23618101783.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f414ef8dabd37cb7bb0e4805b2454d0a/82418874924.pdfIn PDF document text
- https://abyway.lv/images/ck_images/files/85207579275.pdfIn PDF document text
- http://rentaruedas.com/files/others/kipikijojuso.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608296f851748---53798023614.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/meferukowoxatimem.pdfIn PDF document text
- http://imhkayseri.com/resimler/files/nigamavexusubitet.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114136a08b23---tasiretox.pdfIn PDF document text
- http://teraval.cz/res/file/5822257206.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f29517d3b1f13882f848b4021e7edc5f/87329648202.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/bepaxeruliruzoreku.pdfIn PDF document text
- http://weiken-rc.com/upload/files/lugebofeberaginiwuv.pdfIn PDF document text
- https://fonixkoncert.hu/upload/file/9054991479.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_off0000d6be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6BE	18676 bytes
SHA-256: `13006e9f7740fcf369c1a72561334668b8acf44f9fbae445ca078bdeb82e9d4a`
`font_01_sfnt_off0001049b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1049B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CB2	11000 bytes
SHA-256: `7b9efa5e4f597f0e7b67446544c9811a23ac5691f8a182265dfaa9aff14b57c0`

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