PDF malware analysis — malicious · 1f587c39865457b1

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 06:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: fce59b1f0994169a8349fcc1a125e4c8 SHA-1: 96fb5b5685ec8543d6fd4e3fda4b1546495dc2ff SHA-256: 1f587c39865457b19aed89b1088c1b77bef9fe77b3ae85edaf56b6c6dac7c3e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many with 'utm_term' parameters suggesting tracking, reinforces the phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=stream+golf+online+free PDF link annotation
- http://transportdiverse.com/uploads/files/66911154796.pdfIn PDF document text
- https://cribpointonline.org/cribpointonline/userimages/file/bomaf.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/mefex.pdfIn PDF document text
- http://rucodelniza.ru/userfiles/file/14256508743.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9be7f018ffae9af27d921b9713e1ce0e/vawegedaki.pdfIn PDF document text
- https://thailonghoang.vn/upload/files/94896360637.pdfIn PDF document text
- https://big-affaires.com/img/pics/files/18692052156.pdfIn PDF document text
- http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/1590888033.pdfIn PDF document text
- http://medrea.ru/upload/files/domixunowaxenuzarizegu.pdfIn PDF document text
- http://gt-outillages.fr/ressource/site-image/files/jomonigizimemisu.pdfIn PDF document text
- https://discovery99.com/userfiles/file/9861421246.pdfIn PDF document text
- http://righetti-ticozzi.it/userfiles/files/35554529396.pdfIn PDF document text
- http://pandoraecza.com/genelresimler/file/sopafiridodenabapipivubiz.pdfIn PDF document text
- http://ppfi-online.com/userfiles/file/87124088187.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282c9ec4fe---33553103379.pdfIn PDF document text
- http://esebtekstil.com/resimler/files/86985862508.pdfIn PDF document text
- https://sahodayabbsr.com/test/fckeditor/file/95505996204.pdfIn PDF document text
- http://insureavisitor.com/userfiles/file/59794500241.pdfIn PDF document text
- http://permagnet.com/upload_files/file/210913061931104238v3bst5.pdfIn PDF document text
- https://toscanafantastica.com/userfiles/file/84277013246.pdfIn PDF document text
- http://www.pro9apps.com/app/webroot/files/uploadimagesfile/neposofexifobavazipexime.pdfIn PDF document text
- http://hantechwelding.com/userfiles/file/2021090916523273499.pdfIn PDF document text
- https://senarathgroup.lk/assets/media/file/wopub.pdfIn PDF document text
- http://cnhhgj.com/upfiles/userfiles/file/20401561466.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ec73b1cf6a2da53078191cf4a98181f2/4744849461.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_off0000cbd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBD1	10464 bytes
SHA-256: `62eaac6fe31b8921135424e879f7a2b2230f9d739e35280c33a2e66274ada774`
`font_01_sfnt_off0000e391.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE391	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fba3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBA3	18720 bytes
SHA-256: `bf734633396e9c1ae55056efb0d1a78d13e4cea1c473f2106e2a17fffde59948`

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