PDF malware analysis — malicious · dc652d17baabe739

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 09:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: d7884bc7b2cc102285db8794a33e9089 SHA-1: 953831e3c764f3b4be6e3fdf79dd6137da329ec1 SHA-256: dc652d17baabe739ba37fe464b32a9535a6909c2ba99c13abe8c83d0f6c3a6b1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier as malicious. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, often associated with SEO poisoning or phishing campaigns. The presence of 'utm_term' parameters suggests an attempt to track user clicks, further supporting a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://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_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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