PDF malware analysis — malicious · af6028869a40a384

MALICIOUS

PDF

87.0 KB Created: 2021-09-21 03:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 3dc83888857a4ca1e26385e50611f320 SHA-1: 73c78c9b11656c2bc28575d58bd332dbd2b6adb7 SHA-256: af6028869a40a384b174ace06dae3d9ed514faf7ebfdbef78d7271831467c463

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to distribute malicious content or phish for information. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection for phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=money+heist+season+1+episode+10+english+subtitles PDF link annotation
- http://fygl.net/uploads/file/101058348446.pdfIn PDF document text
- https://barcelonamedicalcenter.com/files/galeria/files/wowuviki.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135dee112b09---dilak.pdfIn PDF document text
- https://whitesal.com/data/images/file/7565_20210905151601.pdfIn PDF document text
- http://wych123.com/upload/files/lasomokunilapuwu.pdfIn PDF document text
- http://harlit.com/ckfinder/userfiles/files/20210901_140006.pdfIn PDF document text
- http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/ledizujirux.pdfIn PDF document text
- http://debseven.net/UserFiles/File/86388336570.pdfIn PDF document text
- https://hoangmailogistics.com/asset/site/files/zixelegesesorisevuzetox.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3fb57facic4meo43r7gajdj5r6/57796695030.pdfIn PDF document text
- http://vitalchurchesinstitute.com/files/file/55930348169.pdfIn PDF document text
- https://pianoinprimopianofestival.com/uploads/file/96310212690.pdfIn PDF document text
- http://stelmart.ru/userfiles/file/50605805483.pdfIn PDF document text
- https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/nenusepoxepisixike.pdfIn PDF document text
- https://charming-dc.com/uploads/files/202109031605188637.pdfIn PDF document text
- https://icon-studios.com/userfiles/file/gamoxujigekefanaruzolom.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613f222c144b6---kilafuborulijido.pdfIn PDF document text
- http://honmamon-s.com/img_seminar/userfiles/file/datevivagema.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7e597500---sixenogipenezewudaforalev.pdfIn PDF document text
- http://peak-experience-japan.com/images/blog/file/55017342291.pdfIn PDF document text
- https://ducthai.vn/userfiles/file/wugugopimiwesizeto.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9155b0b1---24824500397.pdfIn PDF document text
- https://bahispesinde.com/gnc/veri/_files/vomologupemefezaz.pdfIn PDF document text
- https://adetexfoamgroup.centralcms.cloud/galeria/files/nawabedemoxafuj.pdfIn PDF document text
- https://www.truck-transport.com/ckfinder/userfiles/files/tepawifufasutotuvepuzoba.pdfIn PDF document text
- http://narzedziascierne.eu/Upload/file/39761814385.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_off0000edd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDD7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105EE	11092 bytes
SHA-256: `a8a2f8f6251535f3ee3b2f28fea52fbfa4aa0fa91df17b5d9fb58b741009f2dc`
`font_02_sfnt_off00011f5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F5A	17928 bytes
SHA-256: `3b26923c661304c42c5e9d5d1f9570ce3d84610293fcb573f140a856e994fc4e`

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