PDF malware analysis — malicious · f5f3bfe92afd5e29

MALICIOUS

PDF

88.6 KB Created: 2021-07-08 06:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: aa2651fb5abd71c03fff028507b2a848 SHA-1: d121f986c901b7934c846da0a580857988764826 SHA-256: f5f3bfe92afd5e291d796544beb681b62296900fd69bb01e3bc856909fce4eed

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. These links appear to form a link farm, likely intended to manipulate search engine rankings or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4a4e429e---viwuzelebopakofajuwep.pdf In PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66da152d9---52751194264.pdfIn PDF document text
- http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/lemujekeroteb.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e57ca857---mutap.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/948a1b1483f74532a9ce61b9ec9d3528/rekejefizupaxofune.pdfIn PDF document text
- http://nt-module.ru/ckfinder/userfiles/files/laxotodo.pdfIn PDF document text
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081915883871---rogodirozoxibe.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823cdc29b3---sekesapifarogemezape.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e6c424caf---xidokuwenif.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5b0c0e86730b08dadafaac8b8410c3d1/42752225383.pdfIn PDF document text
- http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15122365615.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2pftvkbme2k76d4gc6rl5f9253/silitaxejowijobuzadeju.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8t7sdcat9tplfjaj45trucj83h/33404716648.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b7550870f---45080683503.pdfIn PDF document text
- https://everestart.com/images/stories/file/tokejoka.pdfIn PDF document text
- http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/22983853825.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7ac40117---10316649011.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60bc08fe8---32507184722.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777484c2bb2---fifanuwav.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/349023f4ef83f373aedad088087b695d/jezofobabugomizejuxoviri.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a805f73f106---42633388623.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24dbe657e---gakewikudakufawurabofa.pdfIn PDF document text
- http://aostavet.it/userfiles/files/dugujexezeselapikorisin.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=who+made+school+a+thingPDF link annotation
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/73b9164200b98d317589becf9b6177ee/36337143865.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_off0000f9bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9BC	16704 bytes
SHA-256: `9cd3b32c1ce47801f3f91cc3263008743f8cd6a10933238ea2fbcf36dca5ec75`
`font_01_sfnt_off00012528.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12528	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D3F	10712 bytes
SHA-256: `7f86fcad11d7a55223cd60f4fc19d81a616003d788c704a2e1be6a4db384352c`

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