PDF malware analysis — malicious · 8a26502448bb6614

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 00:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 84212cb257902dbfd6f3bca8ec63cb6b SHA-1: 9b4aec2ace7b088929f034c2a0b9ab0fb2a4e83e SHA-256: 8a26502448bb6614875a4211c3500f03882263b9c824e96e1b27c259ed58a6da

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a trojan designed for phishing or malware delivery, likely exploiting vulnerabilities to execute code.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
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://inwebjor.ru/uplcv?utm_term=physics+10th+class+book+pdf PDF link annotation
- http://letdentalab.com/img/files/84586439311.pdfIn PDF document text
- https://zmiz.hr/userfiles/file/suwexitetibib.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1426220ac4814c61a08d81bbfe9a2793/61557134542.pdfIn PDF document text
- https://bawauang.com/contents/files/7956755461.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cd5817fb6---45009225002.pdfIn PDF document text
- https://homestayhoian.thamtuddt.com/uploads/image/files/wogudimedalupukefupe.pdfIn PDF document text
- http://soloparamideco.com/js/new/fckeditor/userfiles/file/xovipakowibiwunigiju.pdfIn PDF document text
- http://vattuxaydunghl.com/userfiles/file/18720166210.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614029e7523ba---5582093031.pdfIn PDF document text
- http://bogaarchitetti.it/userfiles/files/lagobu.pdfIn PDF document text
- https://rintrans.com/files/lepusaf.pdfIn PDF document text
- http://elitk.ru/_files/napej.pdfIn PDF document text
- http://abhinavabhishad.org/userfiles/file/wekufovalavi.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b6401b51feb6058fd3354cb880ca9e69/70521804070.pdfIn PDF document text
- http://d2dgroup.net/upload/files/xutitetu.pdfIn PDF document text
- http://monarchiaerembolt.hu/tmp/zeteniborubizuxavotovo.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d75e3a04fa98dfe481e5675e0d73ee11/zukoxeleduzifabalepirim.pdfIn PDF document text
- http://starwindows.ie/ckfinder/userfiles/files/78608569918.pdfIn PDF document text
- http://zhouzhuanx.com/v15/Upload/file/202192135368177.pdfIn PDF document text
- https://foodsafebox.com/ckfinder/userfiles/files/12582936544.pdfIn PDF document text
- https://mimpidia.com/contents/files/1481349344.pdfIn PDF document text
- https://cosmopolitanhotel.eu/uploads/wysiwyg/files/87618204199.pdfIn PDF document text
- https://bushregenerators.net/userfiles/files/28275029620.pdfIn PDF document text
- http://sun-green.be/ckfinder/userfiles/files/maregikenilemil.pdfIn PDF document text
- http://bonezi.morefriendship.com/upload/files/fezesaxubelapalexoji.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_off0000daf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAF2	10900 bytes
SHA-256: `b8d6b3765535081af5f26d0f4b70b46b79d62fc258705a23422d54e86d6fc8f5`
`font_01_sfnt_off0000f422.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF422	17404 bytes
SHA-256: `ef07b347a485537d0b2412febbaa35d6ac68621c8ef1dd5f864a7544c2201955`
`font_02_sfnt_off0001212c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1212C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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