PDF malware analysis — malicious · 19d1aa3d8c67ff6e

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 05:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: afad0eebd0b97ae15dc3237e25a6b301 SHA-1: 432d4dddfc13f508bb03c3a683e12c3e01ada91a SHA-256: 19d1aa3d8c67ff6e6aa5ace47d9d10140a0b9a2e361a0eefef299d546541a7c9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application is sometimes used to generate malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=cadmio+en+cacao+ecuador+pdf PDF link annotation
- http://szjg.hu/images/file/jititibirokilulap.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3cead7e73d9624e73d2ec120d58b81b1/samagitawoze.pdfIn PDF document text
- http://sahrugs.com/userfiles/file/xomimaziv.pdfIn PDF document text
- http://greenhousehotel.vn/uploads/image/files/kiperabekoda.pdfIn PDF document text
- http://fujavietnam.com/images/Download/fukakebiluwopuw.pdfIn PDF document text
- https://tramhuonghanoi.vn/upload/files/94837722059.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612000b7c9dd2---18998328068.pdfIn PDF document text
- https://silverlabpupsforsale.com/userfiles/files/24815446755.pdfIn PDF document text
- http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/luzelakowixaremikenobi.pdfIn PDF document text
- http://tjtvina.com/Upload/files/10561459807.pdfIn PDF document text
- https://wasael.com/userfiles/file/luwap.pdfIn PDF document text
- http://agendaalzheimer.org/files/galeria/files/petolomedu.pdfIn PDF document text
- http://ktcz.eu/files/files/2722609173.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7321507e3d0fad2b2c97d24db13931fc/poganivunubapobulimudi.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdfIn PDF document text
- http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetokafalaxozinaki.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4caedf373b---18755312502.pdfIn PDF document text
- http://club-integra.ru/userfiles/file/16975878381.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe194ca07c---91229669125.pdfIn PDF document text
- http://kondicionery-domodedovo.ru/upload_picture/file/poxubijifepazarepofoka.pdfIn PDF document text
- https://shop-ecobati.com/medias/upload/files/korojalifemujonemas.pdfIn PDF document text
- http://mopi.eu/ckfinder/userfiles/files/72463576741.pdfIn PDF document text
- http://belean.pl/userfiles/file/winekixedefa.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b440f7ee19---risisi.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_off0000d595.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD595	10600 bytes
SHA-256: `17aac467f280d7fbf54c211597149260b691cea30d53d657611178baf026cbb0`
`font_01_sfnt_off0000edad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDAD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000105bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105BF	18768 bytes
SHA-256: `95e1c2c5c89a4a72510ddf253c33f9bcd67090de5d1362814495f0eec56f33e1`

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