PDF malware analysis — malicious · f8a5bb22d7a9cace

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 02:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 31f53291eb31c9a4b0901cba99156f22 SHA-1: 334c1c9bb2fe77cae7bdfea37874f5818fb02fe0 SHA-256: f8a5bb22d7a9caced6d9dddb7bd1872f43724a6f7e2e96c3f2bdb486bbc590bc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The PDF structure and the nature of the URLs suggest a tactic to lure users into clicking malicious links, potentially leading to further compromise.

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 https://philabc.ru/uplcv?utm_term=dividing+decimals+word+problems+with+answers PDF link annotation
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfec3bb2dac---1672965905.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ef2d6317---95852642812.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efaec1f7c7---8472137661.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa5f89504---kasaraza.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c7adf406e0cb894da9e6980f7980abbb/pabuxijowe.pdfIn PDF document text
- https://argekaucuk.com/nbg/upload/files/84976561744.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1fe63ad45d43e7018e24e449c77b54cc/68171242384.pdfIn PDF document text
- https://jetaime-shop.com/files/vasikasujezirofu.pdfIn PDF document text
- https://manualismedicina.hu/fileok/file/10430266902.pdfIn PDF document text
- http://futurepoolandspa.com/ckfinder/userfiles/files/fezenoxab.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47de62834---vivotonipusolazo.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8298927005e910c991b458b15d0500ff/4040311753.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/74aafddcb98ae840ea029d78a44d59d1/wuzexarepeje.pdfIn PDF document text
- http://innovatepc.com/userfiles/file/zurumeso.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6deda323c0---riboxukizigojan.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c875e96ba68---lewufazinukinefirel.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/morejeriwogewaromosoxez.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/iir8l01cqgk78dra2hkosfge89/bivix.pdfIn PDF document text
- http://nt-module.ru/ckfinder/userfiles/files/juwinigajoz.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/82709233267.pdfIn PDF document text
- http://softwarefactory.nl/images/file/18438133342.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb39164fb2---torawofiper.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/1342648443.pdfIn PDF document text
- https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/326984de5a2ea1d20df3819b6fc4265c/82065587821.pdfIn PDF document text
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec28c6ceae5bce8da25f111b213286cc/tekikosizibeb.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_off0000dfef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFEF	16836 bytes
SHA-256: `c26d3964ff31362d82c1448a96792d54235ebe71913f9dfe0ff7d13660a204c0`
`font_01_sfnt_off00010bbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BBE	11252 bytes
SHA-256: `29f701423ea6ae6af9260500e9865ce72279e9c65f845eb0d37bdcee3aa0fb7a`
`font_02_sfnt_off0001258d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1258D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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