PDF malware analysis — malicious · dcaed44fb43d188f

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 22:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: cc8a7ee64f5be2fa9f11ea84468b5aa2 SHA-1: 30f8d5c9938373b4867c8b141782e8962b6e5ec8 SHA-256: dcaed44fb43d188fe2daabd07c184620cac1d409e51a0425576c8e78306e8dda

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. 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 0.9951

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 http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc55dd64d---90635493589.pdf In PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b7a775c3a333f1966e0ead0e4b786692/35693652900.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9t29kk04q3s87830q5dkripo0b/vedinorej.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8258c0a392---58189737262.pdfIn PDF document text
- http://imailbox.nl/images/uploadedimages/file/pitafetasedegoragasuj.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609038b7eaacc---gofonikoripavazugidufus.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960ac6e7bc4---91390479753.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bf829c7e---ferifofanuvosafip.pdfIn PDF document text
- https://emauto.lv/index/images/up/file/torimonewilixulemojuk.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b320cfe3---31957878536.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/896017420694dc417961fd723df50ccb/70178437669.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb32b4089ec---tilapivosogeziv.pdfIn PDF document text
- http://karat-dobremiasto.pl/userfiles/file/61624306790.pdfIn PDF document text
- http://kutyasturak.hu/images/files/febenuwaw.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f4a66dce---69823440199.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/939c43dd4a7b6d93a5d37cf38b032429/kaxasuroxurilananorutem.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2e9b4eb8c56c7fa01484d6c5decb4fc3/16260574605.pdfIn PDF document text
- http://neodentpetrosino.it/userfiles/files/1465198391.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/285h6sq91epr3ccfpfvbi33r89/95400527319.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/521ead4cd7541a0ad87a0c404fe13b0b/22918135774.pdfIn PDF document text
- https://vigiweb.cl/dinamicos/files/file/12022864910.pdfIn PDF document text
- http://amoy-art.com/Upload/file/doloxetazamekegokaxopofem.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d07d985bda3---lexazixorotob.pdfIn PDF document text
- http://clarasonic.com/upload/file/97632757287.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+law+of+refractionPDF 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_off0000e9d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101E2	17268 bytes
SHA-256: `4b1d222208e8941a98a626d241578dd0c2569c2a9e8773d4e24a2a842e38a219`
`font_02_sfnt_off00012eac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EAC	10312 bytes
SHA-256: `d6214104dda1c9d9308999d49edd6209501242eece4ed44bb4c674a88d33bfd4`

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