PDF malware analysis — malicious · 7f9aae1cfd510abf

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 22:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e8851a7a91dc88a630b153c67e9c1add SHA-1: f331ac2aecd5ab16601e80612843ff84ccc3af2f SHA-256: 7f9aae1cfd510abfbb31ee2233403229edd7e24e60bc99ed7a54ddbbed8b03d2

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to deliver a malicious payload or redirect users to a phishing site. The presence of embedded JavaScript indicates a potential for client-side exploitation or further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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.
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://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93261477538.pdf In PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe0b9b0a9f6763e647914d9ee8e57e78/gugawumumitidusevezolapom.pdfIn PDF document text
- https://camping-du-lac-dijon.com/fichiers/99963581198.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1436ebf316461bb3a82f8d323fb0c28c/79753271002.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/96309167491.pdfIn PDF document text
- http://musclecar-taps.com/js/upload/files/6683867158.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbda2899f6---pekedosugomiruxazoxi.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca4fee672d---mobopuguxibazewatopakobup.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8de856414---zusibasunirexodaxexik.pdfIn PDF document text
- http://gesundezellen.de/neu/userfiles/file/59378686138.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611c470a59463---8168645933.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5af2d6ba8---53057190925.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed5f40ea16---zosogagixuwutewejiwe.pdfIn PDF document text
- https://noble-program.site/js/ckfinder/userfiles/files/fotupevifajuniliku.pdfIn PDF document text
- https://cristalensi.com/public/File/82007931028.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b36fceb882a51f424a93348515636ad8/fofitudawexufizedoxe.pdfIn PDF document text
- http://friulanapanini.com/images/file/8281261854.pdfIn PDF document text
- http://regcureguide.com/files/files/37483467596.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8llgt90vvvelsofno9h7326js3/53007796550.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff17075bf0---63025708974.pdfIn PDF document text
- https://numberonerevolution.it/file/72617533356.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346837a91fe---vesinilezizen.pdfIn PDF document text
- https://abouelhoulgroup.com/userfiles/files/52513232775.pdfIn PDF document text
- http://clarksville.net/wysiwygfiles/file/80915917079.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=que+es+budismo+pdfPDF 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_off0000daa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAA8	10448 bytes
SHA-256: `676551e3aee47b7192d11e8595cb82d094944162d5d5aaae7806e28729434d3c`
`font_01_sfnt_off0000f23d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF23D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A4F	18484 bytes
SHA-256: `5483949bb5f51caefe2faa8af0a02ba0449077c20d321e2f0cba58656a2b2114`

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