PDF malware analysis — malicious · 33d52d6b49133bf4

MALICIOUS

PDF

142.1 KB Created: 2021-07-03 23:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 118950891d4c8dd2b17ae51af0b13561 SHA-1: e901a6abf74c52a7d3f74f028aff0f8274cc293b SHA-256: 33d52d6b49133bf4925b07805d61e0e78a8d1aa48bf83d9bd18af02124c5d3a9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These URLs likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware download sites. The ML classifier also strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9339

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://inwebjor.ru/uplcv?utm_term=two+particles+have+charges+q+and+2q+respectively PDF link annotation
- http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16215149686189.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f116e6c3---17753415110.pdfIn PDF document text
- http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/fadafixabujitib.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160943ec6392e0---58398034810.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b344eec3---zekevaduzidubalidopezewab.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1262cb248---kunapofozepebosatural.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ec04f741---gogagum.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c13b407e---ropemeku.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/57e20e2a60036dca40389ba276075c88/powokowepirixud.pdfIn PDF document text
- http://joyear.com/ckfinder/userfiles/files/weludimedutuzomonarud.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf2b07980---tonukivo.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b24a5d7e4---rexenusulaxewaxeje.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/596f87968066d74c8ded7ac665aa38be/61098981966.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16087b50a1b098---suwugapikodumono.pdfIn PDF document text
- http://www.fonfe.com/uploads/files/9751202414.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/dowefadomu.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vsm3qfgrtidlbh0srnc0kkb636/96522270094.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/pqm76k6ljtog34hlsght5h52si/45131214423.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e90f70ada---gexoputasupepewigekus.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/67648d5947876342824d4096a9fe01a1/6719495091.pdfIn PDF document text
- http://bacsiha.com/public/ckfinder/userfiles/files/zijeteziwomuxomemufira.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160935867e3146---64311690895.pdfIn PDF document text
- https://airshow-bg.com/file/36045268347.pdfIn PDF document text
- http://geose.ru/userfiles/file/80358817701.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aead0827---rifawomoxazo.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2624a418e2---79295293202.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b1228c9d---59078660147.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001aaad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AAAD	20296 bytes
SHA-256: `55e66a173accee4f5946abeea779c9c5eb817accc90bb92f5eee643f99729bed`
`font_01_sfnt_off0001e1b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E1B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001f9c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F9C8	16176 bytes
SHA-256: `8d54eea2dcbac1d04f86c32be94a235e19562501fca921dbc4e305cfb9e737f4`
`font_03_sfnt_off00020f61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x20F61	11288 bytes
SHA-256: `50ad5f7011e3bf84b3a2809c82fd6e48c0beeab82f10266d722a1cbfb9151d1e`

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