PDF malware analysis — malicious · f9c7bdf61a7cb545

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 03:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9877a682cd72e8bce234019e734563cc SHA-1: 98bf98249a02a4a6bc11d6eb7322e4086f9799cd SHA-256: f9c7bdf61a7cb545b47aefd5efa9e3f3f3972b51a32ffd15c22fac28f097d003

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress upload storage and other disposable hosting. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

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://catamma.ru/uplcv?utm_term=specimen+zero+apk+pc PDF link annotation
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/66a7e58802107d9a4c9794bd3c596a3b/85082729457.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337667103ef---74428998236.pdfIn PDF document text
- https://nezrenpin.com/calisma2/files/uploads/dubigakusutodidutiruwid.pdfIn PDF document text
- https://listapp.in/ci/userfiles/files/95871801876.pdfIn PDF document text
- http://imssp.by/data/images/fxeditor/file/dagezotaxobewe.pdfIn PDF document text
- http://envigest.cz/upload/file/14546040652.pdfIn PDF document text
- http://hosungtour.com/FileData/ckfinder/files/20210906_4D05A81AEEF77793.pdfIn PDF document text
- http://rockefellersgold.hu/editor_up/karakim.pdfIn PDF document text
- https://travelone.ae/userfiles/files/50849209779.pdfIn PDF document text
- https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vivuxebikonebizika.pdfIn PDF document text
- http://cityfate.com/files/files/boragawe.pdfIn PDF document text
- https://lanjutpt1.com/contents/files/11679067145.pdfIn PDF document text
- https://luckysurface.itweald.com/uploads/files/613a747f22d79.pdfIn PDF document text
- https://chachachat.info/js/ckfinder/userfiles/files/mumupikesasafawuxe.pdfIn PDF document text
- https://micro-logic.ro/images/uploaded/file/poziwavefirapifute.pdfIn PDF document text
- https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/65463265339.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/62017583117.pdfIn PDF document text
- https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zukeluxorusixolojopusun.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8205cee3d---19510359640.pdfIn PDF document text
- http://lex.tj/img/file/7336366119.pdfIn PDF document text
- https://konyaalotaksi.com/userfiles/file/xirixazapomiramizijufo.pdfIn PDF document text
- http://heatherjansch.com/ckfinder/userfiles/files/42515695329.pdfIn PDF document text
- http://falconartistmanagement.com/ckfinder/userfiles/files/kimelagabameriki.pdfIn PDF document text
- http://www.tivafa.hu/upload/file/melopowogilavonugojiwiza.pdfIn PDF document text
- https://maychieuvinh.vn/upload/files/5551871140.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_off0000dd4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f564.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF564	10452 bytes
SHA-256: `427857d136c7c49099a9a9a5bd8dfcfdc14d2e512d6fbbe4f29a8c982c71e57b`
`font_02_sfnt_off00010d15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D15	17044 bytes
SHA-256: `bde1eca66be995a95611619f3ad53b6b262aadcee06181f4adc1a6000fe94e2f`

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