PDF malware analysis — malicious · fc7ff35bf98a5621

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 06:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: d1890240ccb09dbc88541be0f169e6f0 SHA-1: f2823bfb1900acebeaf4dcce6fa51c5cc66465e6 SHA-256: fc7ff35bf98a562165c11bad46e52e43c182452f8ae95ee205029a0f44ebe36a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for further exploitation, likely as part of a phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://questyme.ca/userfiles/file/mowajokukomivozevorobib.pdf In PDF document text
- http://orderkiwicafe.com/uploads/files/54135812148.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a698264c6c4---87902280694.pdfIn PDF document text
- http://teranor.com/ckfinder/userfiles/files/86614904269.pdfIn PDF document text
- http://smepil.com/ckeditor/userfiles/files/1870020289.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4448636f---52336028541.pdfIn PDF document text
- http://elitsatodorova.com/uploadfiles/file/32113851160.pdfIn PDF document text
- http://drjoecarver.com/clients/49355/File/dubim.pdfIn PDF document text
- http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/7805985621.pdfIn PDF document text
- http://davcpundri.com/css/file/67953291181.pdfIn PDF document text
- https://apartmani-mestrovic-krk.hr/files/dozuwesakelub.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f26b6bb71332f87f9853d0d2f85dfd98/6863196975.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/saredowoxudoxog.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71fc46e15---gozumupasibovelesekivapu.pdfIn PDF document text
- https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863218eb696---juwova.pdfIn PDF document text
- https://porterbrothersltd.com/app/webroot/uploads/51417781480.pdfIn PDF document text
- http://dongshengcable.com/images/upload/File/32202963389.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161265fe7d33eb---10567260888.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160816d1aebe1c---61099892119.pdfIn PDF document text
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160761b4034b7f---fimafabarebarudu.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a888be27c29---41807627136.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/66130550316.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1d264e915ac63ddd089af5be553887dd/76078004898.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afafc684b76---87050902616.pdfIn PDF document text
- https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/62lmivvomke1f7plrc1f4dvtib/fumukujowokaxugusebas.pdfIn PDF document text
- https://yasacompany.com/upload/files/gomikax.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=impaired+urinary+elimination+related+to+urinary+retentionPDF 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_off0000eee7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000106fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106FE	10552 bytes
SHA-256: `19ceac64d1f281905c485763052cb9ace15a4e7035b3ce35cbd25bc78a39abea`
`font_02_sfnt_off00011ef9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EF9	17928 bytes
SHA-256: `e336aa3162252f710a50c9b1873d048457089cc0bfb33e38f08e9e4847b751d1`

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