PDF malware analysis — malicious · d1cea5d6eecff87b

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 18:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: adab00ca0f71aa8e92ea2145065e9e31 SHA-1: 69bb295dc1d62f90689724eb8aa9ad9a02b09222 SHA-256: d1cea5d6eecff87b33d4bf5c1eab57a3e9201c9e9457cc642b4139396b3771d9

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for phishing or redirection to further malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=marvel+ultimate+alliance+local+co+op PDF link annotation
- http://tanabuauto.com/js/upload/files/nepexawatujesivasunaz.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8c97eaa7e08bca82b51999767f761ad6/61478380617.pdfIn PDF document text
- http://pointerboards.com/uploads/admin/files/kosejulebekojatox.pdfIn PDF document text
- http://formpart.com/upload/ckfinder/files/kibuvubodexumeko.pdfIn PDF document text
- https://www.ebenisterie-burette.com/ckfinder/userfiles/files/63739253319.pdfIn PDF document text
- http://mini-garden.ru/userfiles/file/57208140665.pdfIn PDF document text
- https://nakatarikaszel.pl/app/webroot/userfiles/file/wesujejuketuwezifekiz.pdfIn PDF document text
- http://adacu.org/userfiles/file/20210913203132.pdfIn PDF document text
- http://asqcert.net/files/files/remasapidogibupiwenana.pdfIn PDF document text
- https://kimtuong.vn/isc/public/files/fckupload/file/sugumusurix.pdfIn PDF document text
- https://bor-diing.com/upload/files/98863962245.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/kumowagalixorukabusev.pdfIn PDF document text
- https://ihappywash.com/uploads/files/202109031628266107.pdfIn PDF document text
- https://sedefartphotography.com/resimler/files/80421248096.pdfIn PDF document text
- http://agrostroi-proekt.ru/ckfinder/userfiles/files/zimanedafa.pdfIn PDF document text
- http://birizgardenhotel.com/userfiles/file/wagoronosexuwepotukuwumo.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3f6c2cf1---48021706513.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/9342070567.pdfIn PDF document text
- http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/xojetuzodukije.pdfIn PDF document text
- http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/xobefudofedabogenasufonin.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/file/lotaxixoribeliseladatajus.pdfIn PDF document text
- http://caopump.com/admin/userfiles/file/pabuxebekazize.pdfIn PDF document text
- https://huaku3c.tw/uploads/files/202109011648433390.pdfIn PDF document text
- http://dragoniresorts.com/userfiles/38566051226.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422591a7a99---vetizato.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_off0000de38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE38	10528 bytes
SHA-256: `8e61ac8ed8b3adf4e8b2b8411dc4a54b4f744ead90a6f31a096fea10eaacb7ed`
`font_01_sfnt_off0000f629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF629	18008 bytes
SHA-256: `2fd1e593b06368cc7c3009a04ce66dfa1adaed1aac996a4e8249eac0cc429828`
`font_02_sfnt_off000124a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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