PDF malware analysis — malicious · 1f17c967e726f8c4

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 11:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f1af1becbce8528736e6c62c75715a4d SHA-1: 1e5aec3dc7d2fd4c25116c9e5be61aaed9430620 SHA-256: 1f17c967e726f8c4328226202f57ecc9139d7f4abb50285f3a7a354e31aefb04

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/99214951481.pdf In PDF document text
- http://omgmediatank.com/userfiles/files/dakoxojoparal.pdfIn PDF document text
- http://le383.com/uploads/files/66108600488.pdfIn PDF document text
- http://lex-ter.ru/admin/ckfinder/userfiles/files/7738829950.pdfIn PDF document text
- https://phukienbep.net/media/files/bugexunojizigisuge.pdfIn PDF document text
- http://basumati.com/app/webroot/ckfinder/userfiles/files/58518416592.pdfIn PDF document text
- https://globalathena.com/ckfinder/userfiles/files/95608527112.pdfIn PDF document text
- http://youandisagenix.com/ckfinder/userfiles/files/68904905678.pdfIn PDF document text
- http://orosweb.hu/ckfinder/userfiles/files/54460122212.pdfIn PDF document text
- https://soportedevida.mx/ckfinder/userfiles/files/rerujuwaxutuvitebejilu.pdfIn PDF document text
- https://waxparadise.pl/userfiles/file/80582255495.pdfIn PDF document text
- http://hongdanhaudio.com/luutru/files/dubofesewavenaripe.pdfIn PDF document text
- https://ismet.com.br/ckfinder/userfiles/files/xiledesu.pdfIn PDF document text
- https://mmagame.com/userfiles/file/wakazorabikagi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161aea5a2f---65716708522.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353adb3ac90---6494004131.pdfIn PDF document text
- http://duancanhotot.com/upload/files/35061657463.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/rivenes.pdfIn PDF document text
- https://poganyvolgyi.hu/userfiles/file/96503411668.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6d64d598ca9ff67ca6ea862cf8ea3595/juxuwuwunibasibi.pdfIn PDF document text
- https://samowar.me/upload/file/77797142548.pdfIn PDF document text
- https://zoldlepes.hu/userfiles/file/jewoxajexuv.pdfIn PDF document text
- http://studioassociatoemc.com/userfiles/files/74089780881.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130630713c15---69848483656.pdfIn PDF document text
- http://mitsubishilongbien.vn/images/ckeditor/files/30298081387.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=visual+skin+ml+apkPDF link annotation
- 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_off0000dbd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD4	16816 bytes
SHA-256: `30bc9f53ae2d61aa24bfa3b6af3536e88e7b57f606a45a30f974ecfdb4a6a2b1`
`font_01_sfnt_off000107a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107A0	10124 bytes
SHA-256: `7cefdb424123e34afedb3327c12141e3a74c9a615a7b6b29b541c4617da75e72`
`font_02_sfnt_off00011e1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E1B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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