PDF malware analysis — malicious · 407b28f5f9e1e9be

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 21:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b2d79044a60b0906a1755523bc1ff357 SHA-1: ad1717663827bf1258c9db63642f246d3c07c586 SHA-256: 407b28f5f9e1e9be4026a5c6388c86f2a1e15db16e0bc2c4462a412290bec99b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8117d1f60a572c6b821bee90b33e097c/3591255607.pdf In PDF document text
- http://bonfiremadigan.com/uploads/fckeditor/file/73797448995.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5d3cdc6ffa86ded47acc02a760315193/4647776280.pdfIn PDF document text
- http://househouse.it/userfiles/files/devisifowisisikozefadax.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6aca93fc0---mofagowexemexemure.pdfIn PDF document text
- https://shriramsteels.in/public/ckfinder/userfiles/files/xekufezopitovujepo.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9faa400d8---nanoponitojuduvu.pdfIn PDF document text
- http://cauthangdep24h.com/upload/files/novobemud.pdfIn PDF document text
- http://danangsculpture.com/uploads/image/files/ronudanoduzoxiraf.pdfIn PDF document text
- http://fractinvest.com/uploads/file/gutidofogakogizigawe.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9dd5ef25d---65021641923.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/h1b6gah6fbkfomo3g6lrrmb48i/93453821411.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d0a65e3b---78912352805.pdfIn PDF document text
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/76425158959.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ae354caf20a08f6f9b32a740ebc1714/kikikujuwidulak.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/55a119e66e4989e00678e9a9d49f957c/kolelopidap.pdfIn PDF document text
- http://phubozena.pl/userfiles/file/10073053532.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/56417603670.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vivusi.pdfIn PDF document text
- http://merwepizza.com/upload/file/ketotederowipebatuzuso.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788a18a934f---23567521743.pdfIn PDF document text
- https://suativisamsungtaihanoi.net/upload/files/5385648110.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/73mbbi1g466k6q4fgickt3s9p8/75991365458.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784ef60c36a---91755596499.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/zunufulu.pdfIn PDF document text
- http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukidavipufoxazosonir.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hot+springs+cairnsPDF 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_off0000c56a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC56A	10360 bytes
SHA-256: `32859b1f15d96cf132c09c3932e91a8d781077e19be99f0f586700a154f27fe1`
`font_01_sfnt_off0000dcea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCEA	17324 bytes
SHA-256: `86b0f31b881d1ac8a17e64ac06cb960bc3483ebd01da43cf971613297eb436e7`
`font_02_sfnt_off0001098a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1098A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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