PDF malware analysis — malicious · e22c21c2f189881b

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 10:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a60b79d9913d61c952679a2f77e15f95 SHA-1: 4af556305b51c358d122e737fecb228183ce5f06 SHA-256: e22c21c2f189881bcf66c39349909735c87d8bb3a079f257b34b32509e57b5ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://chcial.ru/uplcv?utm_term=hacking+simulator+download' strongly indicate a lure to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=hacking+simulator+download PDF link annotation
- http://uniradioweb.info/userfiles/file/3400006018.pdfIn PDF document text
- http://hb-hospital.com/file_upload/fck_upfile/file/wafapef.pdfIn PDF document text
- http://alptw.com/images/files/44656366965.pdfIn PDF document text
- http://aktifithalat.com/resimlerfiles/pibemujirurewupobefu.pdfIn PDF document text
- http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biboti.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/g08r2ftjukfphgvu2lhfs59rs1/83022059898.pdfIn PDF document text
- http://wsm.hk/images/files/3349047953.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138402cca8b9---jalipo.pdfIn PDF document text
- http://becucci.it/userfiles/files/pujotesuzugelowufupiv.pdfIn PDF document text
- http://ronaldtan.nl/images/photo/46598782716.pdfIn PDF document text
- http://petraifevronii.ru/ckfinder/userfiles/files/zamefavoxitotifi.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87de94bf---73221375733.pdfIn PDF document text
- https://acrgruppe.de/userfiles/file/zunibixiwovakiripoxudi.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2cd54b6b---deligetasav.pdfIn PDF document text
- https://yodobashi-church.com/kedusitisatinixajapera.pdfIn PDF document text
- http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/zumoluxadebazaropemunomeb.pdfIn PDF document text
- https://www.esfa.bg/root/ckfinder/userfiles/files/53403796723.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/33655633533.pdfIn PDF document text
- https://schachverein-marchhoefe.ch/fcsr/news/upload/file/3792982409.pdfIn PDF document text
- http://nuovojob.com/userfiles/files/zusomopivob.pdfIn PDF document text
- http://c2ctrading.org/cms_upload/files/kisakojupubiv.pdfIn PDF document text
- http://dui-antidote.net/images/userfiles/file/60749928374.pdfIn PDF document text
- https://goodline.by/userfiles/file/xogowa.pdfIn PDF document text
- https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/34065837995.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/304f24a8044fab0492b217de156dcb62/74877398964.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_off0000e71e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE71E	10852 bytes
SHA-256: `5baa9f93afd9dc04a402d0cef7f646673ddc9cb63402126956868c06290b8d49`
`font_01_sfnt_off0000fff1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFF1	17448 bytes
SHA-256: `e3c5de28bc9215f2743a4c13b782d9d05263adc187882ea1fd3746684b68ed2e`
`font_02_sfnt_off00012d8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D8F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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