PDF malware analysis — malicious · f2edb1df3a46c1d2

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 22:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 42be8768241871db06a3a011df724cf3 SHA-1: 7c7ab7c61927325629efffaacc1d9326995ec503 SHA-256: f2edb1df3a46c1d2a05d67180f2426a78278b2b08a474bf6d997267bcfceaa2c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to direct users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or SEO manipulation attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=difference+between+hashmap+and+hashtable PDF link annotation
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8a3e39ca4bcbb0692e4f50864db12ec5/57476938439.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f204b9eff7---58848047865.pdfIn PDF document text
- http://abovomedia.hu/_user/file/35016267984.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cd2e553a93f983f056573f06523ca19e/4617448586.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6man2ajrj146517ts3qv1p4s5h/xoxirepamo.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9960a2e46---gedavewiwakam.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34217ca6e---pesajobenejekinopamiwox.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sakaworesononig.pdfIn PDF document text
- http://studioscoponi.eu/userfiles/files/99658281487.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/aebe8384b7c51f235156bf93ebe6d8fe/46429892064.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b343275c8---dakuberawepafidoloragipiw.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7820e6e672---pazakukifagiseroxoguwidef.pdfIn PDF document text
- http://j-club.eu/userfiles/file/19522023699.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bfbebc69364bfc0a33cf96a6d68ee3e4/70065678427.pdfIn PDF document text
- http://writtenmail.com/upload_images/file/lepanipuluw.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vpoqels6noivqutnvim70pbuhi/61325000711.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/givemofadanevazeriz.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc49483f2---61922417942.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/gukamazaxoboxuwodifizamo.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39e588077---boxosubezevoja.pdfIn PDF document text
- https://daaeportrett.no/upload/file/digog.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60549a5b8b---52855933653.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160845379e971e---89818482041.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4dd2d2ce---kigetodekubozajovesiz.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ls50dafgm41igjae73jb3vs7v7/wuxatowalekeromudokak.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/07410ec14d59f1e4d8fda4c003dd0b99/52594896237.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a64299a8---lokivata.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61b1589f1---mefojazogonusowarizo.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_off0000f0a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0A3	17180 bytes
SHA-256: `0cda9336d8becc0f14d46aaaac546f198267a2bd51ce246387c65fe96cc65660`
`font_01_sfnt_off00011d9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D9B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000135b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135B2	10992 bytes
SHA-256: `12b12eef6f258aed5d25153e27f799b765b974ac712283d0d6848fba4d48f872`

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