PDF malware analysis — malicious · 9c6505eadbe5c529

MALICIOUS

PDF

148.2 KB Created: 2021-07-24 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: cd168fdeec04441b5945f22b2dac2bf7 SHA-1: 8c44e0239059fa7dea7abc1813ef9d278721b0a5 SHA-256: 9c6505eadbe5c5293fefbbea2948492bf1de147bd2e91a0bcd9e6805b1d9ce91

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9782

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af69a7f212f---4368046498.pdf In PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbf6c3bb3---lafubunuboxifi.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5989fba03e---43267246456.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/70e82ae7cc4faf62cfd1a9c0c49a2c4f/95027376399.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7ed87594e7ef8923109844f3e8017a5d/97888803922.pdfIn PDF document text
- https://myphambambi.com/webroot/img/files/86876141159.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6c3cabe1---sufemomupow.pdfIn PDF document text
- http://utuin.net/files/fckeditor/file/91850946465.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4276a243aa---41221063851.pdfIn PDF document text
- http://sgpeo.pl/users//file/11775154265.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d9c613faf941b6f16e35f28ffb4543b9/tavubesuw.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ebac65ef5---35354886589.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/250db2ac221e2343505773a9f4fa212c/jewugevejiredumibijazijib.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f433a54b3---92738630425.pdfIn PDF document text
- http://cmtdental.com/upload/ckimg/files/romev.pdfIn PDF document text
- http://ipmarketing.net/userfiles/file/wudozawiwuwol.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/javimarupexewotajufaligo.pdfIn PDF document text
- https://tractorpulling-emmeloord.nl/upload/file/88698739490.pdfIn PDF document text
- https://riolospettacoli.it/filesUploads/file/texebasabovanit.pdfIn PDF document text
- http://planetamama.ru/files/file/39897972792.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608492b5a306a---temokiki.pdfIn PDF document text
- https://ubranni.com/uploader/files/vututurunokukakexiravaz.pdfIn PDF document text
- http://amphorabeautyclub.com/campannas/file/29856912021.pdfIn PDF document text
- https://alsharqcc.com/userfiles/files/nalajajisagefetinamulala.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a2b30cd09daf464e3364f76ffeed42c0/48010363805.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb655d01b---15485561977.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=case+laws+on+arbitration+and+conciliation+act+1996PDF 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_off0001e040.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E040	11008 bytes
SHA-256: `2258347a4d1b7d54a0ad212b1946d5bdc2bd3de229ea07ce3c144ffe915c8de7`
`font_01_sfnt_off0001fa07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1FA07	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00021219.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21219	17980 bytes
SHA-256: `1f316e5bd4dfefb84cac72c869039ef2ea929b46b5d32fe87eb79b6bf1a9b5d8`

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