PDF malware analysis — malicious · d5bfced5c1651ee2

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 20:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 36568e0b172cfcd42cef221182eb86ea SHA-1: a21452ea4873a18e0fe459c3519c674110fd5cca SHA-256: d5bfced5c1651ee20cd6b8896aeb7cd911ad2488a7e68ade09e507a5ed47ceef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9844

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 http://maszyny.pl/userfiles/file/piziruvozokobaw.pdf In PDF document text
- http://www.pattyn360.com/upload/forum/files/vajilikokimuwizo.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7cd9558b4c11244555d65489f49bd60e/96648019968.pdfIn PDF document text
- http://thuephotocopytaihanoi.com/upload/files/kiridunuderufu.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f0aa3e4bc---77149604843.pdfIn PDF document text
- https://shoppingplanet.ro/ckfinder/userfiles/files/21531393621.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e8a9e313---96976266630.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2fbd3cdcf29cfdf80defe87a0a1411b/8745637186.pdfIn PDF document text
- http://www.macrolepidoptera.hu/userfiles/files/zowebifilatexenarudojibar.pdfIn PDF document text
- http://www.lasallelille.com/admin/ckfinder/userfiles/files/92020876949.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0df385b2e2---besalubigejuronofipiseji.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d012d44d6---1231706470.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50833a376---tiwezuguvuzuju.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/210c3121150b0ce4fbb199f646c8c290/bagagaxebirojojesavir.pdfIn PDF document text
- http://st-johnson.com/Uploadfiles/files/82641817384.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dojexasoserowi.pdfIn PDF document text
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ccad8bdf2f14d284103ba08a8b15c253/94406876806.pdfIn PDF document text
- http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/gubojifadixadimiwes.pdfIn PDF document text
- http://mizuho-co.net/file/ck/files/4710097868.pdfIn PDF document text
- http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/73133178129.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6cb39e64c---48841732531.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083966f5511f---90967728147.pdfIn PDF document text
- http://cn-daomeng.com/upload/userfiles/files/095b3aa0bd060a11c6066fd6372a592f.pdfIn PDF document text
- http://bezpiecznamlodosc.org/files/file/wedunuxez.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-6/file/46074266424.pdfIn PDF document text
- http://atol-res.pl/uploads/file/kenenep.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5822f193d8594f156f87684001630b8c/jowusivexoronibox.pdfIn PDF document text
- http://polenes.cl/userfiles/file/49296195905.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cortes+de+carne+de+res+finos+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_off0000ce39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE39	10596 bytes
SHA-256: `67144249b441e1a4909600eac5a30d131eb75a6a3936131fd937c1e7e078ea77`
`font_01_sfnt_off0000e695.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE695	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fea7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEA7	19712 bytes
SHA-256: `5bf67dd7f7083d664e8b68df66b26ebb7b190c9e556bef8ed315ab2accfe8886`

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