PDF malware analysis — malicious · 74f043e09bda4093

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 17:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: ae644e06fd2fd90ce0feffae51a2a93c SHA-1: 60228431345db37847b7c153d3962c33916f45cc SHA-256: 74f043e09bda40930937fab41f86779dc7445f28dcc2792ec3ec4dfb030c0ab7

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. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://catamma.ru/uplcv?utm_term=cienaga+de+mallorquin+pdf PDF link annotation
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/30e1f90e027be821255ab25cba02c2d0/827828307.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/230373a0348b78771ca0ee2d71454cee/fazurofeb.pdfIn PDF document text
- https://hankilfood.com/userfiles/file/20210825210039.pdfIn PDF document text
- http://sns.hu/_user/file/jujulefudiluxeg.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54fnnljfmuds8v2511e5a8f0p1/2099029505.pdfIn PDF document text
- http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/5443291060.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ebe86ae0---78470604138.pdfIn PDF document text
- http://remproekt-m.ru/admin/ckfinder/userfiles/files/60343367705.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d626f98a7c3eb19602ba74fa571ebb66/jojigud.pdfIn PDF document text
- http://toyotarentcar.net/FileData/ckfinder/files/20210623_11A859FECCA8ECEA.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc89f97b23---48620095599.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846216a3384---992922890.pdfIn PDF document text
- http://titadoorbinhduong.com/upload/files/15690789849.pdfIn PDF document text
- http://cbstav.cz/file/60432166138.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1feb1cc574cc2766cbe9f54a0d4d6a81/wizab.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c116f41ba6e---bosog.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210804070912.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/24b3425487532279a442a41dfea65062/kesapivijela.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab35ad16ae---vapij.pdfIn PDF document text
- https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6b53c201129eb1d92b427876d7f46de2/24798433646.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/94481544929.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/67322984043.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad4d469afd---bijabirisetofo.pdfIn PDF document text
- http://xiaohecollege.com/d/files/42757448990.pdfIn PDF document text
- http://aeon-dev.com/uploads//files/202108092343254514.pdfIn PDF document text
- http://businessvaluationapp.com//fck_files/file/jatube.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3bda1c930---65088943513.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_off0000d272.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD272	10852 bytes
SHA-256: `0c643f0aedf8581325313e841f89d95454a931b6768558ce028d1f5c8aa72f4e`
`font_01_sfnt_off0000eae8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAE8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000102fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102FA	17884 bytes
SHA-256: `9113b27bce4a5c54117bd0ce56794373119534349799ebe875e9d76bae2111b9`

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