PDF malware analysis — malicious · ef725218e2e53e24

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 08:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: a1b6de1eeb0068641fa9589d432df8ef SHA-1: 59acd7890fae8341119d36be79a2307be080e516 SHA-256: ef725218e2e53e24a9ea7d0711175adeb7988bf7327e283399abeee787aa00cd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of these links suggests the primary goal is to facilitate phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 6

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.
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://infrive.ru/uplcv?utm_term=sanam+teri+kasam+old PDF link annotation
- https://virtrade.gr/userfiles_lybo/file/vidiwosotijirakupazodisa.pdfIn PDF document text
- https://dichvuhappyhouse.com/upload/files/53398084686.pdfIn PDF document text
- https://glamweddingdesign.com/userfiles/file/verikerapul.pdfIn PDF document text
- https://073741256.com/uploads/files/202109091007462505.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140c34a3aa97---22694715591.pdfIn PDF document text
- https://halkum.rs/files/78314007877.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc9e463d8a---2544575084.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7c3tpkbkvpu8ibcgtj73c73rii/gevotogedo.pdfIn PDF document text
- http://www.dfdtrading.sk/ckfinder/userfiles/files/31163994548.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161304c0fc7724---sozelivovi.pdfIn PDF document text
- http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/32910752770.pdfIn PDF document text
- http://ubytovna-krumlov.cz/userfiles/file/ravexozobamuvi.pdfIn PDF document text
- http://amkchem.com/upload/files/13152873305.pdfIn PDF document text
- https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/ximuzot.pdfIn PDF document text
- http://dailygameresult.com/editor/UserFiles2/files/fanudurufumapi.pdfIn PDF document text
- https://nedimgame.net/calisma2/files/uploads/kekevufotom.pdfIn PDF document text
- http://www.autoservis-hubatka.cz/admin/upload/ww/file/6929998300.pdfIn PDF document text
- http://rowadhr.com/app/webroot/upload/files/jureborurorakugi.pdfIn PDF document text
- https://cytairtool.com/test/userfiles/file/20210918_3e5f4.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/pesojev.pdfIn PDF document text
- https://gemma.lucien-sv.info/uploads/files/6142f0011b5b9.pdfIn PDF document text
- https://www.stnedu.com/ckfinder/upload/files/30793203206.pdfIn PDF document text
- https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/41499077968.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6a7db127b91dae7025c19385094901e1/88108542087.pdfIn PDF document text
- http://dh-life.com/ckfinder/userfiles/files/51690614362.pdfIn PDF document text
- http://graviroz.hu/ckfinder/userfiles/files/99531756691.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_off0000b7a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7A2	10576 bytes
SHA-256: `290f991f5ee4125cf4475eee7b5a333629cfbf0d255c67ffe5c5aa05d14dbe09`
`font_01_sfnt_off0000cfb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFB2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e7c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7C4	17960 bytes
SHA-256: `b2641694eec9c334c4ee3ff0cd142ddf34f961d88ab0e275d63cb1a37dd415d7`

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