PDF malware analysis — malicious · b349436e654ba8f1

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 01:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: fb1cc63e83857b983d2e8ea6dc11da9d SHA-1: 91f0c0ad4cd720b82a8ac2c4a91d2598702da5ae SHA-256: b349436e654ba8f1666146c627764f5ee980a2f08c5987af0abe0e3adc03ac5f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature indicate a likely intent to exploit users through redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://hargagila.com/uploads/image/files/nimerexijim.pdf In PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/870a944eea5084f37d70ead9eea79529/93120873065.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df189110aef062e3d20b8e020249a3e7/kilogaxuvelus.pdfIn PDF document text
- https://preciseenergygroup.com/media/bobuvoretariv.pdfIn PDF document text
- https://monyetmesum.com/contents/files/23140925216.pdfIn PDF document text
- http://jocoseatee.com/userfiles/files/2926126912.pdfIn PDF document text
- http://eakqshop.com/ckfinder/images_store/files/91205178855.pdfIn PDF document text
- http://comlark.ru/userfiles/files/58926909610.pdfIn PDF document text
- http://podhoru.cz/userfiles/file/36877618095.pdfIn PDF document text
- https://epagneuls-bretons.fr/caningest/images/file/75312734752.pdfIn PDF document text
- http://suitianhose.com/uploadfile/files/gipoki.pdfIn PDF document text
- http://telegid.tv/userfiles/file/83077123283.pdfIn PDF document text
- http://ahnil.com/userData/board/file/zutatalos.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614da7b2cc603---sukozodobox.pdfIn PDF document text
- http://yachtales.net/admin/userfiles/files/takufobado.pdfIn PDF document text
- http://tzoetemondje.be/uploads/files/webafiz.pdfIn PDF document text
- http://jualumnitoronto.com/editor/uploadfiles/38816622385.pdfIn PDF document text
- http://sethhukumchandschool.com/userfiles/file/5109239000.pdfIn PDF document text
- https://cvzona.lt/resources/img/files/nofokujumakagixoperi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453a693982e---pitawugusi.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0383b3fb782bf21d1defb3b4758adeaf/vuxopabazavifamaxeteva.pdfIn PDF document text
- http://15449010.com/FileData/ckfinder/files/20210905_0DE98CA8D4B6578B.pdfIn PDF document text
- http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/gefuxapupo.pdfIn PDF document text
- http://tonwen.org/userfiles/file/kawivozazipurodevosepene.pdfIn PDF document text
- https://cartolmania.it/file/6393988705.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=xnxx+games+appPDF 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_off0000b3cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3CF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cbe6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBE6	10248 bytes
SHA-256: `7e8445bc441c210c8e20cde5f77587736c116c633cc50124f9565cc54b96083c`
`font_02_sfnt_off0000e2e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2E0	17452 bytes
SHA-256: `5ad9124270901c50de5ed13767b4ce277e5b684d69b6123c21ba5fa5f8284c15`

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