PDF malware analysis — malicious · 4ac8febf7fd64eca

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 13:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 0755554e1274cb31b696130a9f7614d1 SHA-1: 9689eaeff94c2cabb766689c91725245ab8612fb SHA-256: 4ac8febf7fd64eca5e9ad5dbe9e2f78cbc5062b0aca4a31f6efb85be8cf16847

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, with ClamAV identifying it as a phishing trojan. The file contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it is part of a phishing campaign or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=periodic+trends+pdf+answers PDF link annotation
- https://avistravel.ro/userfiles/file/jaxuwarunatok.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3d2f8e2d2b4bde8dd104657f1647491c/49676450565.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ha4fqamvfimk0qjgf7ekutd2su/18179412981.pdfIn PDF document text
- http://mujuerp.com/uploads/ckeditor/files/20210611143810.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d16a321c6---89783561419.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec51b6ddd0---lajewavulolofilexemakux.pdfIn PDF document text
- https://chingchia.com/uploads/files/202108310024075032.pdfIn PDF document text
- https://birsamundapark.in/userfiles/files/24769384733.pdfIn PDF document text
- http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/pudurotese.pdfIn PDF document text
- http://timecraftz.com/userfiles/file/9130246906.pdfIn PDF document text
- https://chilegastronomia.cl/uploads/userfiles/files/19372690885.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6df07b29---ruregemurajozemolofubi.pdfIn PDF document text
- http://mousike.it/img_ins/files/61594004181.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6aa36e5ccffa457b33868ab57836a809/32468532596.pdfIn PDF document text
- http://geodez.com/pliki/file/46552413443.pdfIn PDF document text
- http://greenmodels.ru/uploads/files/kabumumura.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/qg3laofmjivobf1erapij1alrp/38487763111.pdfIn PDF document text
- http://clinicoral.com/img/userfiles/files/33313352647.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/vozuripoxuzukiruk.pdfIn PDF document text
- http://abwingsjanaf.com/uploads/files/woxelanufusufax.pdfIn PDF document text
- http://chrisdepanneservices.fr/Sites/cds/files/42290701744.pdfIn PDF document text
- http://boston.pl/fck_pliki/file/97269537284.pdfIn PDF document text
- https://fitness-sport.it/userfiles/file/lozososobelejav.pdfIn PDF document text
- https://cobaltinc.org/userfiles/file/60614650783.pdfIn PDF document text
- http://ordinate-ltd.com/file_media/file_image/file/77958878248.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_off0000dd01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD01	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f518.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF518	10656 bytes
SHA-256: `dbefbaf1f86225242ee8f69fb90ae5a194c3199dd0d6d07879b0c2ef5d3e0e87`
`font_02_sfnt_off00010db1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DB1	17816 bytes
SHA-256: `306310b76d07263876006c7d1595e97db814cd3cef677ce2fe8af577bc48384a`

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