PDF malware analysis — malicious · 758f2282545c0aa1

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 02:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a041a4f12635dfaf7d107f72cf409baf SHA-1: f26d5958f240811c13292a05eea56a74fbda4336 SHA-256: 758f2282545c0aa1edbf23b0d55e1ae2bf72d51b8979347d386b6b0d32627fa4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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=how+to+change+default+pdf+viewer PDF link annotation
- http://kvbm.org/pds/userfiles/files/gujok.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b80b1e90348cfad789bcae8c327b15e0/23228480090.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/9a79e79c32783fc6cc687a5c7476bb7a/70723364415.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5675c0db01---59167178346.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6289da9fcaa6e2da731d58ddcc7d90d9/zubokifokuxemenuwuk.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d323c02f---51200730195.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4025fdcae1f4661172cf136d84f11c88/xosezuzidigepe.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mtosiv378npkehf3rjmu010s71/tedajuduputivugi.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070311f06e0a---bunir.pdfIn PDF document text
- https://samsunyapi.com/userfiles/files/75859169521.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f675322f01d15e23fb6b665f21fd1a9d/sojofojujazaguxumepilakaz.pdfIn PDF document text
- https://yssnewlessons.org/UserFilesTwo/file/98320036469.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c49c7994---naxinufofisex.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609001953ee65---nomujawifabuzufakutedukal.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7gdl9sd5bosnjqq4hge4ckov2/dikejegavatelexogatozeg.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/51501dcb77c6878d61f3dbd4ed05f349/70999720873.pdfIn PDF document text
- http://drironcat.com/images/file/vusub.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e34bc5cc1eab5e3318e83bb2dfb452fc/xutewivabuxudevuxapexo.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/08872ce2678630189ce854f601b78077/zajigekejuwevilatonefikor.pdfIn PDF document text
- http://oilmachineydy.com/d/files/rejubevokiwejefuzus.pdfIn PDF document text
- https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531175404.pdfIn PDF document text
- https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/s75k1miebplsou1gb15g6gnvqa/74868636339.pdfIn PDF document text
- http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xawasuwoxagoribarov.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/01895ca83af9c07e9f00ab777eda0edc/28190502903.pdfIn PDF document text
- http://innospectrum.eu/hirlevel/file/48464320137.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_off0000e8a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8A3	17116 bytes
SHA-256: `566868bc8bb509cfcb18645276dc5f45f54a9f7cc852cd1bb1e881008f623552`
`font_01_sfnt_off00011597.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11597	10976 bytes
SHA-256: `ad2b4741691b57d31838f920f0bb162e48547e579e4fbbefa6d54a66102556a3`
`font_02_sfnt_off00012ecb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ECB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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