PDF malware analysis — malicious · 7a5321f660abf42c

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 12:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: afe191020c24c65d07e735a50b90e825 SHA-1: 0d6fbac30f50e2cf669bf1c950256ecd036c00f4 SHA-256: 7a5321f660abf42c1c7bf558c5fad44a43dcded6e4ef089cd374e9c85607963b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and ML findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9936b8b64---66427949534.pdf In PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/495vpino58n9ac6uno8pge6vc3/88302549292.pdfIn PDF document text
- http://irpuyesh.com/cache/fck_files/file/zabukisotutabopilutin.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/15800fe64978bcb5abec49f6d49d0b6b/48626384971.pdfIn PDF document text
- http://criollo-cocoa.com/userfiles/file/45575610362.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098a02fb62cf---biwoditazujolutesexanifas.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/db9f54b6a60a7a0c69df475373516b5f/jafowineritupakezugufip.pdfIn PDF document text
- https://biocenfis.es/uploads/assets/file/fifipegurakatula.pdfIn PDF document text
- http://www.brickchamber.com/ckfinder/userfiles/files/81963468914.pdfIn PDF document text
- https://tatsolarlight.com/uploads/files/90970557800.pdfIn PDF document text
- http://atek-ent.com/upload/file/zijifutobosutalobeja.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9mbvsf65q079bco5io6d687n10/rotosawa.pdfIn PDF document text
- https://aaaxxion.info/images/file/fisajizulenibepe.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/42882198122.pdfIn PDF document text
- https://ovalpolycoats.com/media/fobifurabuvuwugiraduraso.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd55d096---92921708176.pdfIn PDF document text
- http://karate-talence.com/newsite/userfiles/files/jidagavufewowane.pdfIn PDF document text
- http://chromowane.com/userfiles/file/29151191927.pdfIn PDF document text
- http://autoset66.ru/admin/ckfinder/userfiles/files/72101470232.pdfIn PDF document text
- https://smgbid.com/ckfinder_userfiles/files/41177275123.pdfIn PDF document text
- https://creteservices.com/FCKeditor/userimages/file/64859765151.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b168c457730---wiwolesajeji.pdfIn PDF document text
- http://mfcwestenkwartier.nl/beta/userfiles/file/74787017944.pdfIn PDF document text
- http://hidramaco.com/files/files/97668037654.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929eac5662e---58265899339.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=beveiligd+mailen+pdfPDF link annotation
- 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_off0000de87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f69e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF69E	10476 bytes
SHA-256: `dfce8e337dcbc25af0968db4820c488b409bdb501307551f14ce35bff32880ac`
`font_02_sfnt_off00010e22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E22	17296 bytes
SHA-256: `1b82cf2ee8430b3f462e31a7d66263f324d8df0270963c361dd0c0a76ef05f67`

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