PDF malware analysis — malicious · ffc3868ec940bab4

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 19:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 03b877ab37b97a9356c59c1e3e7ea6dd SHA-1: 716c4e9f634c9c85877120d2df48c5359b1d406d SHA-256: ffc3868ec940bab4e20703719d56b330a3c9a6743a225ecd73f92b44597a1fa5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous URLs, many hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution lure, potentially disguised as legitimate content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
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://huntic.ru/uplcv?utm_term=automation+questions+and+answers+for+interview PDF link annotation
- http://fred-robin.com/ckfinder/userfiles/files/pizuboxelixenigemilawux.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/21763f506b297b4b655fd6ce3da810ea/zuxesaxeluxudu.pdfIn PDF document text
- https://mkserwis.pl/userfiles/file/pewinoxujures.pdfIn PDF document text
- http://oroblupiscine.it/userfiles/files/fejulasuwepabogewifejiwuk.pdfIn PDF document text
- https://stopserv.ru/files/file/vakejenane.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117ea3f2b083---gilizutemizijumix.pdfIn PDF document text
- https://makanbanyak.net/contents//files/70586676648.pdfIn PDF document text
- http://studioambienteterritorio.it/userfiles/files/donomunituwa.pdfIn PDF document text
- https://sce.tw/uploads/files/60c7486f3d5b8.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80773e5c2---sivijimubajilonij.pdfIn PDF document text
- http://vuonlan.vn/data/upload/files/4485269377.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c1mjnvl5c5dl4jm1pukicpagu1/46363739389.pdfIn PDF document text
- https://clinicscrm.com/img/files/sepivekemir.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb3ebdf95---37501604667.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2qn0il9pqvqt46jumh5dgfah3/19722385386.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b3a8637c---sasaguwebibizolo.pdfIn PDF document text
- http://cedule-plachty.cz/files/file/loluduvudexorodel.pdfIn PDF document text
- http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/41958189741.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/h8so2qvj6bhtek11tkso0r5ea1/46889073750.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5f9ac83dfd7253dedfd38bf36317dd06/17072005412.pdfIn PDF document text
- http://cityclick.it/userfiles/files/zujusa.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6693aa74dd---53050850330.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1560571ef346143b0d0b4c2c40c6b25d/16366540597.pdfIn PDF document text
- https://pjkconstruction.ca/images/file/xefekotenusofurofivokubow.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac07baf853---joromexajegegon.pdfIn PDF document text
- http://provia-events.de/pics/fotos/1/file/28217750321.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_off0000de6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE6F	17596 bytes
SHA-256: `f558527a1415e2ae1c72cdafe7a2105e9d50f17b4575a73482098376315a399a`
`font_01_sfnt_off00010bba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BBA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123D1	10848 bytes
SHA-256: `d759fdae9e0bc1cea4ae0125ff729164b2c6c911a19132571b0d3f082ed6e147`

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