PDF malware analysis — malicious · d0f75872a6950620

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 14:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f290e49df75a4b34d8b8a069d8f58330 SHA-1: 05f3c31b9e6f459361b104cb0d7f59be90c803dd SHA-256: d0f75872a69506203bddb2116a3cc6e65ec7b551123bf043fb801e2806a27ae3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://kamionosnyelvlecke.hu/userfiles/file/12585951981.pdf In PDF document text
- https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/efb1eade9ff52b0c327734b69741bb99/33123917537.pdfIn PDF document text
- http://royalleasingny.com/admin/images/file/26127838113.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/df170469144d10ff19d8aef4aa7ebcad/korazujesilejadapom.pdfIn PDF document text
- https://rijst.nu/userfiles/file/laker.pdfIn PDF document text
- https://perfecthospitals.com/FCKeditor/file/31565080327.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/de8f8ca399522914ccf3742e9732f3c4/kevevexirefipixaluwumuva.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cch6hdtlusni2apeggi8s2e7f0/vuzoxexufumanenikug.pdfIn PDF document text
- https://bbox.ru/images/shared/file/78600997631.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/fegiwinewemoku.pdfIn PDF document text
- http://condominiobrisasdelnorte.com/userfiles/file/38367163928.pdfIn PDF document text
- http://www.europesolidaire.eu/userfiles/files/xunozolirunobabeti.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcae65cbcb---rikarig.pdfIn PDF document text
- https://myclubowners.com/userfiles/files/11740232757.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ce7a06dd6---40098189230.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78718b65b9---32128034264.pdfIn PDF document text
- https://ruh-center.ru/userfiles/file/7009755871.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ad273a649b774c4df62fe44a62d185f9/48249504645.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9umljp612jhldor38kubk9cem6/67545115552.pdfIn PDF document text
- https://cuisinescartier.ca/upload/editor/file/sodelepagipelenigabod.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd5e26dc8---nerepuwijezodetimuxalekel.pdfIn PDF document text
- https://clickkedai.com/userfiles/file/wabadepaxiju.pdfIn PDF document text
- http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/170460581.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1592bcede6262ad8c240103baa5836e6/vikoramutaz.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=permutation+and+combination+questions+with+solution+pdf+downloadPDF 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_off0000d0c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0C3	11360 bytes
SHA-256: `66aca6bf7e8eaae9f7ea109be62616f16a5a78a4c5d38d24fdba8c3c2ffba8a4`
`font_01_sfnt_off0000eae4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAE4	18960 bytes
SHA-256: `a9f6342f4c81d17368325a249752a78f1bbea2cb5aa61e754c0afb706e5dc9da`
`font_02_sfnt_off00011cc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CC7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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