PDF malware analysis — malicious · db44ef6b1faa9efd

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 18:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 689f29e8726731d23d699186bfd40414 SHA-1: 675eb845221141d60b62471bf48a0bed920d432f SHA-256: db44ef6b1faa9efd2809b02df49c8929432be0e049065d45826642bfef068073

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=delete+notifications+android PDF link annotation
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3e0bf229---88028304594.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d232bde31a---juvulovixaz.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v6i09e3jd3mjscqdjtkl7mq8ia/nuvizeparesojuworus.pdfIn PDF document text
- http://oipipleszno.pl/userfiles/file/vajovogu.pdfIn PDF document text
- https://zlato-eu.cz/upload/files/xudemikutisusekovi.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/25768498455.pdfIn PDF document text
- http://kalmi.ru/upfiles/files/44021920899.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ad6ad96579556f5b16ec69193168a1af/ligovowomofo.pdfIn PDF document text
- http://kondicionery-noginsk.ru/upload_picture/file/71962078970.pdfIn PDF document text
- https://weilaimachinery.com/userfiles/files/35052480935.pdfIn PDF document text
- http://jamesandsons.ca/userfiles/file/kavuna.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/58f240138cc194a659b8714e326e4953/xilubizomorod.pdfIn PDF document text
- http://naturenhuman.com/app/webroot/userfiles/file/61909111353.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/70198861342.pdfIn PDF document text
- http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76000271464.pdfIn PDF document text
- http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mabavozux.pdfIn PDF document text
- https://nusantarabet4d1.com/contents/files/98128851357.pdfIn PDF document text
- https://bestrecycledautoparts.net/images_i/file/29423865057.pdfIn PDF document text
- http://mdsalon.ru/img/lib/file/75522927418.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140243cefa48---27751126690.pdfIn PDF document text
- http://hitelesen.com/userfiles/file/71572163442.pdfIn PDF document text
- http://makinsushi.com/uploads/files/60235902466.pdfIn PDF document text
- http://www.clc-engineering.com/siteuploads/editorimg/file/kepubeti.pdfIn PDF document text
- https://stvorki.ru/files/file/ximorimebovegozekiz.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_off0000d415.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD415	10468 bytes
SHA-256: `7e1b3fc20edf19fbe19c2e78668ec6befb8ce225e9220beec449a3f8b866c906`
`font_01_sfnt_off0000ebf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBF3	17908 bytes
SHA-256: `0645316cd60df4bcf50208da698f78f9f82087b9f61c02f4c9f3b570634e8d9f`
`font_02_sfnt_off00011a1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A1C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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