PDF malware analysis — malicious · 887f17ef9e37c28f

MALICIOUS

PDF

76.3 KB Created: 2021-08-06 23:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ab8d7ff86da1d76df8f51479d30cc012 SHA-1: ff8ecb0c50149282fa946c116e5ed507785c2f6a SHA-256: 887f17ef9e37c28f6fc81e07657418eb0eff9b83ed20d7289e4157d04eea9aa4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The embedded JavaScript, combined with the link farm structure, suggests an attempt to redirect users to malicious content or phishing pages, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://srhs1980.com/clients/877094/File/gakonuzasugevegefor.pdf In PDF document text
- http://yonseri.org/userfiles/files/japiwoniradezidifav.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c266b609a5---lesikozafoxirojuleg.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/86c14c0ea73d75aed8d0c4645fc6af20/93377958484.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/16aab9e7e64462750014521ffa55a355/koburokunef.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160833940b1f06---41828346323.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608380041e444---21580354438.pdfIn PDF document text
- https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/08dmeqp4jam472kng93ebjnbdm/20296358612.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/efb19be157b403a66a9570b3b8100d06/zuzuzevosotoxu.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9695bcad8---lolibi.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3c2b1de5---jasoz.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a97b9527---3883669181.pdfIn PDF document text
- https://thaiwoodengames.com/files/upload/files/losesifuxabuzuti.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210706220127.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/76ab8bd0a5365c27e26558e742bdc1df/27006564451.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc8a8d3f---kibokivunilepitinovolu.pdfIn PDF document text
- http://www.ufolep-69.com/contenus/files/rufamadutonafox.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e36c884cccd---pejoxozudatelejuneb.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/5467764125.pdfIn PDF document text
- https://clubon.top/uploads/files/towijedobajixexigebomi.pdfIn PDF document text
- http://sdes.in/uploads/fisitegelasubux.pdfIn PDF document text
- http://www.lnk-creation.fr/upload/file/kipevusupotajoro.pdfIn PDF document text
- https://imad0c0.com/js/ckfinder/userfiles/files/6230480229.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=khiladi+786+songs+free+download+mp3+doregamaPDF 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_off0000c511.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC511	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD28	11524 bytes
SHA-256: `79db8f46a126842d03ea30bf23be09312c03453ce80b938c7a440b16a32d0bcc`
`font_02_sfnt_off0000f81f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF81F	16432 bytes
SHA-256: `4adb29e37c0706296b6fffe3f3759a54da81c90ea1ffe322c7c0b498b01b6670`

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