PDF malware analysis — malicious · 3bde0bf217594937

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 19:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: f0643768aac935b68f807e568ed893e4 SHA-1: dd2f66165fc81cc0b2147cf1bb0e4adc22761f9f SHA-256: 3bde0bf2175949371e132ce2c8bc04966706cb3c579f289b7b7459bc5c33d152

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to distribute malicious content or phish for information.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=apk+yoshi+island PDF link annotation
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2pnhd60q6vqrrpiujnqllhg5jq/vumafitewetajadamemolefud.pdfIn PDF document text
- http://taxilitomerice.cz/ckfinder/userfiles/files/46334593623.pdfIn PDF document text
- https://jsptti.com/ckeditor/ckfinder/userfiles/files/32908366123.pdfIn PDF document text
- http://registermycompany.in/admin/userfiles/file/sitowixisufap.pdfIn PDF document text
- http://ohmytour.kr/FileData/ckfinder/files/20210910_A40652A744EB706D.pdfIn PDF document text
- https://legend-chang.com/UserFiles/files/30935592705.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/76120169713.pdfIn PDF document text
- http://uts.edu.co/portal/app/ckfinder/userfiles/files/tujufutizixamimopolu.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-9-16/20210916112400605342.pdfIn PDF document text
- http://blossomtour.net/FileData/ckfinder/files/20210913_24B15F7D61DA43BD.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/832a50a69882eae60eb16d2546990049/65274052363.pdfIn PDF document text
- https://www.ewdel.cz/ckfinder/userfiles/files/15809229421.pdfIn PDF document text
- http://okna-dvere-online.cz/media/upload/upload/file/nujuvoxojane.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a2e98feb7da2f92a98885dcd150b43d0/nazojolo.pdfIn PDF document text
- http://www.sauminandy.com/fckimages/file/voridejububimaju.pdfIn PDF document text
- http://maekalocal.com/Maeka/UserFiles/File/30418969184.pdfIn PDF document text
- http://kashima.cc/userfiles/file/tabosotivosogakik.pdfIn PDF document text
- https://tommytest.dish1314.com/data/html_editor/files/46496700549.pdfIn PDF document text
- http://alocainghien.com/uploads/userfiles/file/87371918085.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc6d0d202---kerolegokunopigaxorozit.pdfIn PDF document text
- https://stehovani-ostrava.cz/static_pages_files/file/40832074112.pdfIn PDF document text
- http://fandimnarodaku.cz/upload/file/69852490101.pdfIn PDF document text
- http://adirondackseafood.com/ckfinder/userfiles/files/farepabusobig.pdfIn PDF document text
- http://tasteofruraleurope.eu/upload/File/45140796002.pdfIn PDF document text
- https://juvelyrikoscentras.lt/Files/file/53765648204.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_off0000b3d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3D9	10348 bytes
SHA-256: `7bbb80b997e338e4bfe346e3c31df40918e4c7c3a0efe9344f3a2c9886e092b8`
`font_01_sfnt_off0000cb1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB1A	18436 bytes
SHA-256: `578c344dd7a5b6a2afda04ea49b9982cf3a4100556124c8f0c9932ddab8bfc31`
`font_02_sfnt_off0000fb2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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