PDF malware analysis — malicious · 1bcb117b0cdb54d0

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 12:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 596f5eb171e6cc9418f2a50e3f7ea32d SHA-1: b29dfabb472bcce2e38ee7560fe0b38cdcd9fe6a SHA-256: 1bcb117b0cdb54d0ad177a89f344f369436065dc9243cc9fdec7ed93bf770f7a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous external URLs, some of which point to compromised CMS upload directories. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially malicious external sites via embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://nguyenhungstone.com/uploads/image/files/jonuguz.pdf In PDF document text
- https://latework.cz/soubory/34596750178.pdfIn PDF document text
- http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/21788076054.pdfIn PDF document text
- http://www.dkmodels.net/ckfinder/userfiles/files/xibarurunapibotuko.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/57052597249.pdfIn PDF document text
- http://denge.aero/upload/files/51902237102.pdfIn PDF document text
- https://aartipalette.com/userfiles/file/xukape.pdfIn PDF document text
- https://www.adoz.cz/ckfinder/userfiles/files/rujesafogefupupu.pdfIn PDF document text
- http://jplus-ag.com/upload/files/BodyFile__610A6AF86A325.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6277d0174738caa156ddd4286b618947/49165242447.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/20d4ecdfcd0b7d8a74c6c987cb0e770e/zedamawowonozi.pdfIn PDF document text
- https://aadhaarretail.com/administrator/imagetemp/file/tobasiwuvajowubagu.pdfIn PDF document text
- http://alkanboya.com/files/file///59848560174.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0301bcefa---48726804560.pdfIn PDF document text
- https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/431704944.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071006534040---mexanegomesibanasud.pdfIn PDF document text
- http://85560891.com/upfolder/e/files/20210707054918.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bfb2b4334---zanuwoxemogu.pdfIn PDF document text
- http://pietroquatriniarchitetto.eu/userfiles/files/53769055162.pdfIn PDF document text
- http://kemenyseprosiklos.hu/upload/file/52557937135.pdfIn PDF document text
- http://veejaytechnologies.com/userfiles/file/viserajabej.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/bojotajipekapuzit.pdfIn PDF document text
- https://verandapattaya.com/userfiles/files/4168107587.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f8212926---46278939462.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=compendium+of+pharmaceuticals+and+specialties+pdfPDF 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_off0000ba7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA7A	15864 bytes
SHA-256: `44f6a6d3d0522d17af1e120821980d478285d8050454cad4fba6e3d77921450e`
`font_01_sfnt_off0000e2ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fae1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAE1	11016 bytes
SHA-256: `77808a2ebac4231741c107dfd9df2bd86a778108e7e80ae4cc9ea8379ab320e1`

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