PDF malware analysis — malicious · 3fac59f12a770b15

MALICIOUS

PDF

82.8 KB Created: 2021-07-17 14:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9ca89b9cd1a770c93579c22c8e9c8970 SHA-1: f6c0a4ed220be2a041f3739d2c1e9ba1c0cb423c SHA-256: 3fac59f12a770b15b474086077908c31ec8d61cece4f89639f2410a35b9e8c00

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting it's used to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, with a high probability of being a phishing or trojan delivery mechanism. The presence of multiple distinct hosts and link farms indicates a coordinated effort to host and distribute the payload.

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3a941087---nitowulole.pdf In PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4f4b2ded2b0cc3eae0e9bb4be263433f/guwotexokolanurakep.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/50f7b5ba23c24da80544c232701dbcdb/42892251701.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844cc2d6e1e---gagozo.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2667f002ee4487b487446a8986b49302/8574320136.pdfIn PDF document text
- http://taeguektour.com/FileData/ckfinder/files/20210601_780D5F1FD5EC3586.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc23826ce0---85748882684.pdfIn PDF document text
- https://pisangmanis.com/contents//files/tivefeveninekuvulojutana.pdfIn PDF document text
- http://tks-forever.com/upload/2021/06/19/file/latomobipalowabufaxidij.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a227949a9---gaxenunenexebalafafoze.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d936059919---gutevisudizof.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b83df380---45366501874.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd60dc41160---16402314152.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084477ff29f3---39261528765.pdfIn PDF document text
- http://phrabat.net/UserFiles/File/15202119032.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed3018abcd---69399236115.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c67f60473a6---7398965270.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5c5a6733d3aaecfa901aa1a012dafb67/xikezawodejobepujisivep.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e1f48731eb2ccf91dbbc9f02c0d27403/zuxodi.pdfIn PDF document text
- http://mkconline.com/landmark/ckfinder/userfiles/files/kikatanuvo.pdfIn PDF document text
- http://heninrealty.com/userfiles/files/53629090732.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4cb4a0a887363f7377e683e42e87e790/belomibe.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/efd665d94747bfa1fc3cca9065efb4d6/21864167581.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099ccc3ce656---5332047124.pdfIn PDF document text
- https://minhkygroup.com/luutru/files/gazulaludikum.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sound+of+silence+byPDF 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_off0000e0c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0C3	17660 bytes
SHA-256: `04c5401160583a92147b5239cdfafe327189969831b5d07b893ac0664c08c596`
`font_01_sfnt_off00010e26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E26	10536 bytes
SHA-256: `482ced23146ab1e822b976a4c6c9cb6f4626b809f6ddf32baf9214dcfa42be1a`
`font_02_sfnt_off00012645.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12645	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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