PDF malware analysis — malicious · 364b6f23060a9a7b

MALICIOUS

PDF

83.5 KB Created: 2021-06-28 10:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: f4dd84397a9fcabd8d6c8241ae5e9f96 SHA-1: 64836d569f4f7874d17ed21946c62ad3908ff3b1 SHA-256: 364b6f23060a9a7b0955153b4db3dfc1e4e95df580524daf4b27fe62423de323

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malware, likely via a spearphishing attachment vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://coretry.ru/uplcv?utm_term=hall+and+knight+higher+algebra+pdf+free+download PDF link annotation
- https://sharadsangam.org/UserFilesTwo/file/70398631674.pdfIn PDF document text
- http://perlawarmii.pl/userfiles/file/47372816101.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071812bcea44---69578173123.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7f5b92f3---xiwekudolazonopusepowa.pdfIn PDF document text
- http://gorisum.net/fckeditor/upload_file/file/85023578985.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/letalixudoxesimeriwod.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed573c51df---pobazodegevotutabowezer.pdfIn PDF document text
- https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/e4b31307d38bf0f5924370beb3d93a28/burezupawagemol.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7391a20a---desumatenomijukakakatavun.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/476fb9575c20645804116a91370a87fa/3883033708.pdfIn PDF document text
- http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfeeb2b4b---vivirajogiserikafeko.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/29db0966b0c269188668971aafa3ef46/valisexowuvozutosakosu.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n58v7neccoqg7dgnrb2nb7uvbs/gisosog.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/59682b1eaeb10fd0527d3f9e0e12d0f5/86198186506.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe742a2e53---rimaboxowakofiwalezej.pdfIn PDF document text
- https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/6f72d1f472d3f95e31be1bef193136cb/zirup.pdfIn PDF document text
- http://esipro.fr/userfiles/file/levalutevoluzaxodeno.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a48eb0b3b64---zerifibowu.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4bf035ab8---begugowapepe.pdfIn PDF document text
- https://akanaymatbaa.com/calisma2/files/uploads/kilarovojemixere.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/97156ecc8213317dd4e6b952cedfb038/10576843237.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b640649e01c4fb98676f33085223bcca/pejapemogapajusedofidowe.pdfIn PDF document text
- https://autopratichesas.it/file/dudebebumifefu.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/fefutetat.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3759af14---70632328305.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eqg2fq7jq7q1oof6v3cp3m69t/kagadepatapukokesolobab.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/51399939616.pdfIn PDF document text
- http://janyska.home.pl/_mjanyska2013/fotki/file/25433394769.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_off0000dafe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f310.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF310	19844 bytes
SHA-256: `99b52bed3524c34b7fb8871c642bdb84661f39f067280ef986df81d74bbf7166`
`font_02_sfnt_off000125c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125C0	10916 bytes
SHA-256: `8916f59ff76023a95603c72bb79a9fa2276ee7e3edcc6686df0f6ebcc248d5b2`

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