PDF malware analysis — malicious · 9573aa741fe29db8

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 11:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 7e2725301fef4d38627f8ed14cb09391 SHA-1: ba1ef8b2b5f12d3f20fe095050885d82cbbf76fb SHA-256: 9573aa741fe29db815a29fd1fce4f5b40b6a92a8d13d17bf72b193f1d56193f9

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://philabc.ru/uplcv?utm_term=titration+of+sodium+carbonate+with+hydrochloric+acid+lab+report+pdf PDF link annotation
- http://harchovyk.com/userfiles/file/3921886813.pdfIn PDF document text
- http://monroehighwildcats.com/clients/40160/File/90057996804.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/sukimobigukedamuto.pdfIn PDF document text
- https://serpavenger.com/ckfinder/userfiles/files/4753823156.pdfIn PDF document text
- http://alemotta.com/resources/original/file/73553631629.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/mibajuduxamojapazozasal.pdfIn PDF document text
- https://skiclubraonbaccarat.fr/pdf/setofefiwunonax.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/watefugidoboselobifeju.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/letodumedegisetepotepus.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a86f0673449aa157019193e62bbe833f/2996935253.pdfIn PDF document text
- https://kildevangen.dk/files/tunodivuxunawo.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd7580d0e---91597788647.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210606150452.pdfIn PDF document text
- http://ikuma-car.com/js/upload/files/72364508109.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b74407c5---moxowetasesa.pdfIn PDF document text
- http://tbvshungviet.com/upload/files/28727118438.pdfIn PDF document text
- http://ahchala.com/img/file/13410111925.pdfIn PDF document text
- http://nothingelsematters.net/pharma/images/files/40725449030.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/600ac0ab904c1848b4b29d38b2435afe/99377070537.pdfIn PDF document text
- http://szermgrt.hu/uploads/ckfinder/userfiles/files/garukenetepuzejib.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706d032d522---895280870.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/bp365okr2ndj4k0kabv825mfd4/67307488913.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/14048569998.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_off0000de7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE7E	17560 bytes
SHA-256: `14e29e8c330a7c673c423234c13dff4417e0c8e18861b12d7ab92a6486abacbb`
`font_01_sfnt_off00010b8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B8E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123A5	11288 bytes
SHA-256: `61376c670a38fda18653be1e72d2b85f5a182f686f7fa10752fcc6acdf053733`

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