PDF malware analysis — malicious · cef3482befd106e7

MALICIOUS

PDF

87.0 KB Created: 2021-07-18 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4293d6cbf23a90ab537806db1faf0ede SHA-1: 0d33397a4c96956c0533b2abbb01670f90a7a465 SHA-256: cef3482befd106e7eed1faf335d89d9b30065cfb7bc0d6dbe94c829e39375e6f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of UTM terms suggest an attempt to obscure the true malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nl1qdbg5mrghtlqvf3pn7jrtpo/75249772076.pdf In PDF document text
- http://jandenzobv.com/image_uploads/file/70487969348.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a82a8daae5455b3c24ada546e57b8817/3994007794.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4svr1b4cjklgiu6cdk4g3udfq4/61214349363.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fffa8235---79236111196.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/895475a9228d97dc086cae553aee5cfe/87433623449.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a32a9a01910926a3b47e1875bf8433ab/70033110671.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/lba98a348pmn4iclveo8011vn2/73589609876.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e995f9d3fa---dumodovobefu.pdfIn PDF document text
- http://firstcuwire.com/file_media/file_image/file/81801132340.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/lulavibu.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609087803fd73---8174802898.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0207f32dc3de6e06085d629eec00c120/51597234968.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed558eda4---vurenaxaniw.pdfIn PDF document text
- https://ridersshop.it/file/jolakevezi.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6924beaf80398929e893bffff6b1c64c/fofibise.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/oih8a0vg1daq21omqmgimg5g32/71054504746.pdfIn PDF document text
- https://noddy.nu/images/file/jikefuzutamina.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41d09370c---bisamimekixobuxura.pdfIn PDF document text
- http://zoncmswebsitebeheer.nl/files/editor/file/53890987429.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/naredtf869ur7nkauagp7ja32s/bodimex.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091967ec7c17---96767315106.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/p6c1tu315iik8ano3enmcm6go3/35915989448.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf7e4d4d66---6841861253.pdfIn PDF document text
- http://activesolutionelectric.com/images/file/8782379519.pdfIn PDF document text
- http://www.contal-farmer.com/uploads/files/bexedirutakisuvevepuluru.pdfIn PDF document text
- https://aspirans.com/files/file/kufuw.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=social+security+number+on+birth+certificatePDF 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_off0000effa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFFA	11028 bytes
SHA-256: `eb74d51588c87699a3829edab1dd365bc54a76dc84da5b384627e591265c68b2`
`font_01_sfnt_off00010975.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10975	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012187.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12187	17028 bytes
SHA-256: `3a96aa146abd47b8b66a6f2f5655bab42ac78c37ec02b9ddccb0a5345160d529`

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