PDF malware analysis — malicious · f899878b16d29962

MALICIOUS

PDF

115.5 KB Created: 2021-09-04 02:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 86bdee5cb6888c801e9386bb1ec0fbfa SHA-1: 2a72882e9e9dff0d6068bb0ef8a1bd6b62713785 SHA-256: f899878b16d29962cdff0a64452acb2114d6adbb9d63808fbcb2ae847fd3369c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites for further exploitation. No scripts were extracted, but the PDF's nature as a link farm implies an intent to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9385

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/18dce413e9248cc1629484ed1c6fcab6/jojezupijupigatidega.pdf In PDF document text
- http://czerwoneiczarne.pl/files/file/74527187311.pdfIn PDF document text
- http://twfbs.com/ckfinder/userfiles/files/61028594351.pdfIn PDF document text
- https://directorvincentchow.com/fck_filemanager_upload/file/75611321587.pdfIn PDF document text
- http://velo.hu/UserFiles//file/safixadowezuko.pdfIn PDF document text
- http://bkdesign.ee/userfiles/file/38672324299.pdfIn PDF document text
- http://dietetyka-24.pl/images/files/34070370030.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0f2852c315cd6e7daca61de3790dbf93/ruzigipezatanaxikegarilen.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc24b0cbe---42906060115.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3e01eff7---22103988671.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7ec64231e---89049292662.pdfIn PDF document text
- https://abofahed.com/userfiles/file/79285574582.pdfIn PDF document text
- https://coil.hk/upload/files/tomav.pdfIn PDF document text
- http://universalthailand.com/images/uploads/ckfinder/files/87668187924.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c8942evbg40n53fg6qq78aqc81/81841704685.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987766baffc---26214422376.pdfIn PDF document text
- http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/45df53db03d1ae1eecd0bf632da8c8a5/20008890284.pdfIn PDF document text
- https://phr4u.com/files/tuwarinizebogopixetemaxa.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/90582475427.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160962ce616ab2---pegexurirunewat.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082828f60350---ximurimunajaredoxezet.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/cbusd847ftgpjg79a78qs3k3hi/pevafawenakitedi.pdfIn PDF document text
- https://reazfarah.com/ckfinder/userfiles/files/jobesalogekizo.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8e996cb2---babinekadajanape.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab0853666---17222912228.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=marathi+grammar+books+in+marathi+language+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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012e12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001461f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1461F	1840 bytes
SHA-256: `e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729`
`font_02_sfnt_off00014ec7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14EC7	11268 bytes
SHA-256: `b93598aeb2d528faee00eeee4b7a380c35e7816d0c6cd50049435da9c9ff3eeb`
`font_03_sfnt_off000168a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x168A0	24356 bytes
SHA-256: `47783428cdea88dce90dc8608164396a96b1bc828d35a722492fc126aad6b478`
`font_04_sfnt_off0001a695.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A695	16244 bytes
SHA-256: `fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d`

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