PDF malware analysis — malicious · 810d580357751448

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2eacc1bd19c647dc409d5dc3f77713a7 SHA-1: 54ac2e73293c8c406eb60b70d804040364472b88 SHA-256: 810d5803577514482f7ab41dbbdef9be5a8b0a24a2d738be5f5d500fd8013c74

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML flagging further supports its malicious nature. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link distribution, likely to obscure the ultimate payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 http://kolesnikov.pro/ckfinder/userfiles/files/18462518872.pdf In PDF document text
- http://sluchatka-shop.cz/files/upload/files/pusiriwezijima.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ba4c1cfad22a764d237de1e700905ef2/78853066793.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d0d283b6---getenekukedugaso.pdfIn PDF document text
- http://nano-vip.com/ckfinder/userfiles/files/46211321725.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/727d1d60167a6d25172dc82fc6926bc6/kebibit.pdfIn PDF document text
- http://ilovechardonnayhills.com/userimages/80435953496.pdfIn PDF document text
- https://soportedevida.mx/ckfinder/userfiles/files/31118163867.pdfIn PDF document text
- https://karaari.leaddeehub.com/userfiles/files/62043227351.pdfIn PDF document text
- http://kmbb.at/userfiles/file/9864362723.pdfIn PDF document text
- http://keramann.ru/uploads/files/82406019907.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b13c68ff---toferofeku.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a27639679---5089414170.pdfIn PDF document text
- https://flyags.com/editorResources/file///zasitelopipigezazi.pdfIn PDF document text
- http://spc1991.com/ckfinder/userfiles/files/71131766989.pdfIn PDF document text
- http://steelbo.com/uploads/admins/u0/files/20210902105013.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6690562d---faripazagoviniboxuvojopu.pdfIn PDF document text
- https://bikeid.net/ckfinder/userfiles/files/gazakidigow.pdfIn PDF document text
- https://glycocalyx.nl/userfiles/image/file/14531777641.pdfIn PDF document text
- https://kapokcmassage.com/uploads/files/202109031419133560.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/54ffb587952908dfe3aef1cc158b15f3/pufaweberisopijus.pdfIn PDF document text
- http://benetalent.com/upload/files/47280904672.pdfIn PDF document text
- http://dep14kirov.ru/userfiles/file/wejukuzazafiwopepemaro.pdfIn PDF document text
- http://studiobardinisrl.com/userfiles/files/jebugotuwosutimerufijuf.pdfIn PDF document text
- https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/megefijoravumosuv.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+game+android+moddedPDF 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_off0000c3b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3B6	10412 bytes
SHA-256: `fe20c5104a491c47246f339854aa5bd9b4cdef3d6f257824b7e2626965a8e7a7`
`font_01_sfnt_off0000db04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB04	18364 bytes
SHA-256: `fc54c04065a3d2883b4538ed8701f5a106e28a269c491dcdfb7023de74398258`
`font_02_sfnt_off00010afe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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