PDF malware analysis — malicious · 0164105c5294ff75

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 09:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: f8dd41ec5bdb05fbfb8d7803577cac2c SHA-1: e9c5bb8f9c530859532a8f0a1ac104b2191f68fe SHA-256: 0164105c5294ff75d9b2d319a0b59b3be539ca052b1ff762a47204a0f7cea1bb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.7294

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://irlanc.ru/uplcv?utm_term=dwayne+johnson+and+emily+blunt PDF link annotation
- https://dalnoboy.com/data/filestorage/upload/files/mepemotugiwotorevoxeki.pdfIn PDF document text
- http://hkacca.com/userfiles/31040306632.pdfIn PDF document text
- https://apz-arte.com/ckfinder/userfiles/files/boxib.pdfIn PDF document text
- https://getadoc.in/ckfinder/userfiles/files/29864482667.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4050a5226dc5e3323035b3dcab20dd83/78407415185.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b43748ebc81---mudonoxokufalerik.pdfIn PDF document text
- http://www.saaegfpolis.org.br/ckfinder/userfiles/files/72207010503.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fc42f856---56393944123.pdfIn PDF document text
- http://phaptangpgvn.net/app/webroot/upload/files/20485358422.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/41f387313378253909f5da61d7f370c9/taweg.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd15e3227---60969465383.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7ar1sdj8e0ge923r6rka27rsan/39216556454.pdfIn PDF document text
- http://ecohort.com/userfiles/files/9580958156.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608485ff0cd2a---12691714713.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-7/file/lidemiwejezufawejuso.pdfIn PDF document text
- http://lpkgoodframeupvc.com/userfiles/files/86156924826.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c002da35419---72003860762.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607917675fb86---9133200443.pdfIn PDF document text
- http://toastwarenhuis.nl/app/webroot/files/userfiles/files/ribugezozi.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/li06n95otl4uje007kpvjdaorf/87703254265.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7c3d62dc---96462646231.pdfIn PDF document text
- https://digireg.ch/upload/gugejikixas.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5545c8da3abfb6c8bd9b55c354b56f48/17167871740.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1deff028f---56915535654.pdfIn PDF document text
- http://stauarchitetti.eu/userfiles/files/gusiworuparozesokov.pdfIn PDF document text
- https://magiccat.pro/ckfinder/userfiles/files/vapoziwok.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608425c1268d3---lidurulokaw.pdfIn 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_off0000f5e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010df8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DF8	18540 bytes
SHA-256: `35659236b187d6d95c00a53c35f6a186cb5982c541aaaba3322c9e84290f1534`
`font_02_sfnt_off00013e35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E35	10984 bytes
SHA-256: `199ba671bc01369179ef3243e8de224972c3ccc0409db23f02e7baed763690c6`

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