PDF malware analysis — malicious · a8d45fb7ed1d2489

MALICIOUS

PDF

99.3 KB Created: 2021-07-02 18:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 871703f11217269cd4bfa02fa80ac9fe SHA-1: 58203af3d73f2436d8d3dfdc530afac6fb18f84e SHA-256: a8d45fb7ed1d2489341aabd929872ef920dd4189d2892d5e4fa5f50c9eaafbf6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm pointing to multiple compromised websites, many of which host PDFs via vulnerable WordPress plugins. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of numerous external links to potentially malicious hosts is a strong indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

Heuristics 5

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.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/29jbpf2gmqjag7f3ftdrgmrkf5/25561465237.pdf In PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3c8efc093fbf530bb1141d507b943ff5/liginokitopared.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9pnrkqeabu2l9k6tdvi9s5s5ul/34115084508.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0f907172047f5d291895f7a6d3a5d83d/modaburafugam.pdfIn PDF document text
- https://businesslife.com/content/files/votofipaburefeja.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c1408cf---7364554124.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9432f2c---dufagedu.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b49798168---58628449701.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160718ef8e03c1---2825923031.pdfIn PDF document text
- https://aiaciran.org/cache/fck_files/file/kosalugabilat.pdfIn PDF document text
- http://ziconiavip.com/uploadfck/file/wufevetulagu.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ba0dd144f01cd166557ee976c37a8a47/41618241158.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/rilerokekugolujoluvu.pdfIn PDF document text
- https://micsys.in/userfiles/file/692649364.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608303f5635ca---95878452682.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/14a3bc643eeca5fbb116fc16ab19b725/lakowebebonugukaboxi.pdfIn PDF document text
- http://cooleywestbrook.com/clients/865832/File/nimibixafafudaz.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1b29052c235f056696950a0a7d0cef3a/71608991303.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4eeff1d96eb3d5f04a5cfa87dca516df/zedanifaxevigevofamu.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/892f804937ffd435c247d01ade2b32a4/93248792303.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i8he5cq35af04l9d32i6igugc4/8677831556.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071852849d3f---17794294819.pdfIn PDF document text
- http://brno-skoleni.cz/ckfinder/userfiles/files/pokafasegolefej.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/79e576d06ffea3f33ca145ecee8f13f7/93815438123.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3a12a236---pobelas.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=textile+fibers+and+their+properties+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_off00011d9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D9E	18192 bytes
SHA-256: `8665eba537ec8f59181005f488c1a8abb8732499599cf4c91063e001aa30f36c`
`font_01_sfnt_off00014d50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D50	10800 bytes
SHA-256: `1de8d0e3d6245d76c4a5724557bb24312298c21c6e184433c031939e1f97da18`
`font_02_sfnt_off000165e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x165E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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