PDF malware analysis — malicious · c905e4d5aca960b2

MALICIOUS

PDF

107.7 KB Created: 2021-08-01 19:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 625e116b680e2a075cb3e346f17ed89d SHA-1: 7c3584e232c138d44f7efb0667b202a2a9ef1df3 SHA-256: c905e4d5aca960b2a5cf587d9754b23102f0975feb228e25ac0ec64cf878421a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9853

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://garglob.ru/uplcv?utm_term=inteligencia+emocional+teste+gratis PDF link annotation
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bf3c31567d539117575a25db024e57a5/45727140801.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/i8mnpd3aeev4kgbm9o1aqegkfl/49645640522.pdfIn PDF document text
- http://divapharma.com/uploaded/file/xinimenizezeza.pdfIn PDF document text
- http://technestudio.eu/userfiles/files/kosotuzasibumik.pdfIn PDF document text
- https://glycocalyx.nl/userfiles/image/file/rasig.pdfIn PDF document text
- http://mutitar.com/user_img/files/43902146758.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d91dd60abcd---67200567958.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6970c159---komuximasifamofafadafa.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6da6fa78aba3bdddd96111947578deb7/fakakivavofekideminot.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f021f670ee2---kagijazapomulibosenun.pdfIn PDF document text
- http://bioident.pl/photos_fck/file/sagivilolexuzepemiwiderof.pdfIn PDF document text
- https://delphin-restaurant.com/ckfinder/upload/files/vanitugezuzafudi.pdfIn PDF document text
- https://longhoang.vn/upload/files/93504393290.pdfIn PDF document text
- http://siembra.me/uploads/files/65669519793.pdfIn PDF document text
- http://www.mostex.sk/files/articles/file/zakebusalewigovijejaxota.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090e35642fbd---gipijizikaj.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/buzukuzamesifa.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4f9a8897deb7b3e50bb02841fbd98bc9/nedepi.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b12221f3fa00dca56af047358fd1e9e2/63215355387.pdfIn PDF document text
- http://zhhyhb.com/uploadfiles/files/7257195569.pdfIn PDF document text
- http://pspectr.ru/userfiles/file/3301932758.pdfIn PDF document text
- https://muratay.nl/userfiles/file/65649641811.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160855ae48879f---zebavenuma.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/h17sp059r277uapfai0rf47anb/5665384766.pdfIn PDF document text
- http://remont-etalon.ru/upload/files/zututorawavironimaporori.pdfIn PDF document text
- http://inwama4.vn/webroot/img/files/40675020567.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075499e82b60---77448002855.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_off00013897.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13897	10524 bytes
SHA-256: `d7bdb74aff95a1a634121e6e0534fbf83ce833b5586d0129df95550db70427ac`
`font_01_sfnt_off00015085.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15085	21828 bytes
SHA-256: `d9dd09e56a5aa248d34adf88abe2b4e56b7370ff8f6c1b81bc73537d9f78bb77`
`font_02_sfnt_off00018608.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18608	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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