PDF malware analysis — malicious · 6a00189d20421a67

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 08:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9005f799e21ff5be3489e9ed4c2f7fb9 SHA-1: a6ad17a7d4ddc89e0d9ba37859d25331f1acf896 SHA-256: 6a00189d20421a67f22ee3459a5f4da19573e051c731a2ee4a78b08618234e0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external URIs and embedded links pointing to compromised WordPress sites, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://coretry.ru/uplcv?utm_term=prepositions+in+spanish+worksheet PDF link annotation
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9be2f9885c2f6e5260efff07a0274ab3/92054259431.pdfIn PDF document text
- https://munord.com/wp-content/plugins/super-forms/uploads/php/files/0e07c9d6f89233b24e87deeb1c05b95e/gukukebobipuxunedadap.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb03020b7---xofanukisewizixezafigasog.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160740abf111e1---21701868547.pdfIn PDF document text
- http://limoride.net/gallery/file/ralisur.pdfIn PDF document text
- http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/domemudosaxufiparoga.pdfIn PDF document text
- http://ky-auto.com/uploadfile/files/37155274750.pdfIn PDF document text
- http://paitoonbox.com/userfiles/files/kakifawopufoguxufuwefiso.pdfIn PDF document text
- http://pphu-joanna.pl/fckpliki/file/rowokivifarixexopaganajo.pdfIn PDF document text
- https://gagiongvitgiong.com/ckfinder/userfiles/files/wulapevu.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/jupekojazox.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ac1acbe2---jagivudipogoruvabile.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071435ea013d---82021357781.pdfIn PDF document text
- http://learnazia.com/fck/imagesfile/vepukivube.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbe4a2fdfec2b6db75eb053798f05013/99126867910.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/robbmg1d32e6ka3cavi68su2qv/fidetujisamazer.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1445840f66---wazepozidafefebiza.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d47061e380c1d13ca02e2685c75b8b3a/vonimuze.pdfIn PDF document text
- https://monyetjoget.com/contents//files/26146421261.pdfIn PDF document text
- http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/tirewam.pdfIn PDF document text
- https://tractorpulling-emmeloord.nl/upload/file/wowelivonorava.pdfIn PDF document text
- https://bibliotheque-des-arts.com/ckfinder/userfiles/files/34968559294.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d754d52a77---42093400962.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d1afaa989---nitepupon.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD67	17908 bytes
SHA-256: `536ded55ea169230bd8c37eb7349cbee3b3d51be78c56a66af8437bb4b954d8d`
`font_01_sfnt_off0000f864.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF864	19236 bytes
SHA-256: `9fc5562251218d488c3bd32cb8c5036e95007b200bc096bb731c53d79a0f3c68`
`font_02_sfnt_off00012ad5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AD5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000142ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142EC	10480 bytes
SHA-256: `737f3faa29a624b013cf956f4fd01894d2d1bf868aa01376b9aa3ea83cc01544`

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