PDF malware analysis — malicious · 44afd6d104a41bc6

MALICIOUS

PDF

97.5 KB Created: 2021-08-02 17:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: caa04496f12b3e7b1c0bd03921719b50 SHA-1: ef92a37be96227f858608f8efc2316b4d52c1f10 SHA-256: 44afd6d104a41bc6a210bd9485ee35887d14e4732d2545274ed434fe2ca305f4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of numerous external URIs and link farms indicates a clear intent to redirect users to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://irlanc.ru/uplcv?utm_term=suicide+squad+mp4+drive PDF link annotation
- https://latework.cz/soubory/4273617254.pdfIn PDF document text
- http://auksozvynas.lt/userfiles/file/71992236647.pdfIn PDF document text
- http://jacksonreunion.org/clients/71346/File/19559381153.pdfIn PDF document text
- https://stiff.pl/ckfinder/userfiles/files/13990621936.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9lj4eqisse3bv0v6fds9kme01t/88982946847.pdfIn PDF document text
- http://www.vikingmaterials.com/img/78496463149.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/tijuzuvudupomixulasizuna.pdfIn PDF document text
- https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7j955ptclp8pv3cak8erbj1rv9/94784976727.pdfIn PDF document text
- http://zekidilektekstil.com/images_upload/files/64094592546.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a7b21af4c04d643e74ac62fd687cb686/46601376770.pdfIn PDF document text
- http://www.contectrade.hu/fckfiles/file/59527415513.pdfIn PDF document text
- http://sisparts.pl/zdjecia/fck/file/11127997666.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/pexawowofujepipetij.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/file/gurezupi.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074f9de001e9---13909249201.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae6806727---lodimukefizem.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4k1a4et5o2u4j7m7u1ug53co69/78342479341.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/bcc6dsfb8n8hjl39fp108ntsud/20370478791.pdfIn PDF document text
- https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/gamulawowuvuwupawesogaw.pdfIn PDF document text
- http://winso.tw/userfiles/file/dutosedisud.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85b77e90e---44284336333.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2ec124cf8c0de29d14aa8e44d3adc5b0/samuriduxizedofefe.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e5ccff22---77849314481.pdfIn PDF document text
- http://goldcoil.com/uploadfiles/files/zeluvonaduwabitexazed.pdfIn PDF document text
- http://kolesnikov.pro/ckfinder/userfiles/files/wewojaga.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_off00010084.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10084	18360 bytes
SHA-256: `a36cbbbb3cde0258000325394aac49fb945ea9e887279bf8a56acaaa6b8dcd45`
`font_01_sfnt_off00013099.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13099	10772 bytes
SHA-256: `1ed7bdfc34e761cc17245bcdaa212f4424ecdde6224dc9ea1dc284b36039857d`
`font_02_sfnt_off0001493c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1493C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001614d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1614D	16120 bytes
SHA-256: `09562ca2d5000ae2f2345c4ffb282664df80e6add20478162cc85c395b82892d`

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