PDF malware analysis — malicious · 5b50e875a1fce197

MALICIOUS

PDF

99.3 KB Created: 2021-07-05 08:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3641b56ef40e5f888e936add612b50c9 SHA-1: a20a2087a5d4b089dedf04fbe9ce17eb50011c76 SHA-256: 5b50e875a1fce197fe8f2eb2b564afb00c694c250627b2f301e0ba8b76f3d42a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://archism.ru/uplcv?utm_term=cto+and+coo PDF link annotation
- https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f53dc7b833d7a86622094ed570d383db/luwureduw.pdfIn PDF document text
- https://amblamy.ee/upload/file/5747962146.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/dc511f926a4a10f61db51d11cf020b24/51726288256.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afac0d6162a---faxotodaj.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b898be2003d---24732009043.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39b0448aa62c781e83743de57a50444b/rukebevobotiximomogel.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced3f971dcd---8667009500.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fda87b7c2c7efb05d81dceefa088ccf2/83161659808.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072718d7a696---vejediposow.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0417bfa77---73570327987.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160802fb8e2ab2---24097262837.pdfIn PDF document text
- http://imaginove.eu/data/Files/39184888327.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efc791925---51027097807.pdfIn PDF document text
- https://aynadakikemalizm.com/resimler/files/ruburatedot.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ac23656cd1c23e38ad8b9dea19bc4701/11066942043.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160946d2db3f83---7523219308.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2de69295---81608418558.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/64085283269.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/33910436227.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b600091ae---fojoziwiwusigowosamaxij.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/468270bf0728924e74d5851540296b59/pasodeluvejeputitosuruv.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf203e97758---25581254138.pdfIn PDF document text
- http://bachova-terapia.sk/images/file/54359338744.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0a6d4345a---werupurudonuxewobilokaz.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d698799bc4---32879971421.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_off00012082.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12082	20036 bytes
SHA-256: `c436e28a2624a26232c805be3bb7d9282bfbbb8dc3102d4d4c149fcfa030adff`
`font_01_sfnt_off0001523e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1523E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016a54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16A54	9856 bytes
SHA-256: `6dc1eee334819c5ff71cd4272ff6ebcd88b7e04531f5dfc13804c7dc68a21d79`

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