PDF malware analysis — malicious · cced55dd8899d094

MALICIOUS

PDF

90.1 KB Created: 2021-08-20 21:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 911489d333c468079d41a3947f117860 SHA-1: 50752e7a9111fa06e4d1ed6a96f9bc316af3a61f SHA-256: cced55dd8899d09496825a20c3365a64c2f624ee2286c669104a441b3c767ded

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns indicate a malicious intent to lure users to external, potentially compromised, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 5

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://laborke.ru/uplcv?utm_term=how+do+i+add+bluetooth+to+my+denon+receiver PDF link annotation
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c38fbc0b5---lisev.pdfIn PDF document text
- http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/59710429176.pdfIn PDF document text
- https://btcauction.vn/hinhanh/file/27714793866.pdfIn PDF document text
- http://jkbprivateiti.com/userfiles/file/nojelatikoge.pdfIn PDF document text
- http://vektorma.ru/uploads/assets/file/82335519705.pdfIn PDF document text
- http://nail-free.com/ckfinder/userfiles/files/19268509185.pdfIn PDF document text
- https://aashianarealty.com/file/rematujonovipiv.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/moperukinumajepajatukof.pdfIn PDF document text
- http://es-manzokudou.com/yamituki-n/uploads/files/wagaxa.pdfIn PDF document text
- https://travelone.ae/userfiles/files/3632336095.pdfIn PDF document text
- http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/roruwo.pdfIn PDF document text
- http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/80117250598.pdfIn PDF document text
- https://shrisaiexport.com/lightspeedweb1/file/50418960484.pdfIn PDF document text
- http://otoozevran.com/resimler/files/zodikabobe.pdfIn PDF document text
- http://xn--aknmedcal-wpbe.com/uploads/file/35394026791.pdfIn PDF document text
- https://taechoclub.com/FileData/ckfinder/files/20210619_41BE3831E2050C68.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f388f060279---davugixinu.pdfIn PDF document text
- http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/96980493551.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cba020f8739d5b323b5a64f84c3b4aff/wijijepidisazenotujofijo.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44cc447e38---87010253514.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bd594e4---gepogus.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0746c1579890f338d05aff9969c76f6b/pesokurerodibitejases.pdfIn PDF document text
- http://reunionclass.com/clients/7469/File/70786748255.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/82k5qcq803pi316cb8pr6h0laa/puzibalavatigafipomev.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e31a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE31A	10964 bytes
SHA-256: `b286ebd5b2edb5c298caaaf6e7b824c3fc49dfb4a341f32f13d6ffed6691b6d1`
`font_01_sfnt_off0000fc56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC56	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011467.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11467	16336 bytes
SHA-256: `adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa`
`font_03_sfnt_off00012a65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A65	17976 bytes
SHA-256: `91f352c1711459ce6e0326d0adee98fad9dd19a10b7979794230101fbc0511c3`

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