PDF malware analysis — malicious · d179d390a95b04dc

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 17:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9dd89945a3f38021f83dc303cd862074 SHA-1: 66003c22fe5c290cde96bbe6fb455401acf006c0 SHA-256: d179d390a95b04dcd6fb9e68488ba5ecf3d5fc041c72c90438358e77396671ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or link farm attack. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4fbc18c6cd29b2d8195cdf23d2a72655/dexejitosimevisuvadiwi.pdf In PDF document text
- http://www.accl-calibration.com/login/ckfinder/userfiles/files/2579272304.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e336091613aa833742c9c7c314954ab5/73578730227.pdfIn PDF document text
- https://gw21.ch/uploads/userfiles/file/58691030899.pdfIn PDF document text
- http://urjabatteries.in/userfiles/file/nefukasisunakubefijugin.pdfIn PDF document text
- https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/nebibemoxeludix.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/foduwefimabekewiweto.pdfIn PDF document text
- http://mawaevents.com/uploads/file/jaguzifivupofosigira.pdfIn PDF document text
- https://hophamthaibinh.com/upload/files/fakaxuserujaki.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04885fca1---jopojowirefulibogap.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8942a6288---fimuzerulimesukobofetenus.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210627_1182190AB32F0D13.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79cb20c3---gajakexusaropibemi.pdfIn PDF document text
- https://www.passion-rnd.com/upfile/files/2021/07/04/gizojuguguzugonizes.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/38e8a4328da84f8e4f303a5cd6b38520/bakufu.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c38feba23c---34149007691.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8553c8eb---64948946718.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8f0abe44281d9ad2e7c586e02a416c14/3475439101.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608732342398c---gapedaxu.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608664f70b74e---budimeja.pdfIn PDF document text
- http://constantemail.com/userfiles/file/1626402409pakitafuvajisudawexato.pdfIn PDF document text
- http://ccsup.co.th/uploads/ckfinder/files/bagorufawaborazirow.pdfIn PDF document text
- http://bjsprt.com/uploadfile/file///2021053103015793.pdfIn PDF document text
- http://toyotaquangninh.org/data/dulieu/files/85603943802.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a9de31dbd661cfb635cd77b585cfbdeb/54464997789.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manual+de+direito+penal+cezar+bitencourt+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_off0000dfdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFDB	19632 bytes
SHA-256: `cc63338e8971bd8c34c6e5a4cdd7176e990b217ed6bdd60ee4a66d46eeeb2d76`
`font_01_sfnt_off000112cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012ae4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AE4	10740 bytes
SHA-256: `d8a2b73eac235d8a3e57fa2c25461f73ccea33fcb5642ef09887a54c699978e9`

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