PDF malware analysis — malicious · 9e350301da5b13fb

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 17:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 80dcaf6ff06cf139966575103520c305 SHA-1: 63a644b2848f6e0e2472a845d4ca60abf58ee417 SHA-256: 9e350301da5b13fb378eeb125b423f54d3049b1bacdcd2ded2b9fa974e055fde

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF acts as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://ketchas.ru/uplcv?utm_term=synonyms+of+required+in+english PDF link annotation
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/a07tb4k4p7oocke4gg005oshu6/49927893458.pdfIn PDF document text
- https://mmszke.hu/files/file/siderurakivo.pdfIn PDF document text
- http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f305b246ae---texetisu.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7882669ca6779a7b3df6ef3f7f40711f/gikuwot.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4eb2e4f2c---dugerote.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724af6c3f38---70037208785.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3bcc0104534fa0d2f5c4868862e71f0/68435967797.pdfIn PDF document text
- https://gyn-koe70.de/obrazky/file/nixisebaninuseputifuti.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ofc8lu7ljlt1d8mvpfr1sn0fp5/dawulivijotemegidagim.pdfIn PDF document text
- http://imssp.by/data/images/fxeditor/file/geliwe.pdfIn PDF document text
- https://bititechnika.com/uploads/file/10301635777.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087890516cbc---koraxedoxosubelovipi.pdfIn PDF document text
- https://almondzwealth.com/administrator/imagetemp/file/woliriwepiz.pdfIn PDF document text
- http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/96635880588.pdfIn PDF document text
- http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/lababenodibexixibiguw.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/84538194492.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607304b17a884---zanodexifejavarudolem.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/n6ksf2f46n0jnjabrq52p90t11/pijigamela.pdfIn PDF document text
- https://lawtutors.co.uk/js/ckfinder/userfiles/files/13017467425.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080c422fdc---wotubivefod.pdfIn PDF document text
- https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/8f0102e094aaa6661a1f16888961570b/26405510457.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c77cec9b385---baxunirekif.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8cab3796---vurem.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2cdf1af6ae9a0f1217b5ff65a74ee8fd/14813868255.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/595b7744b2a3ff3b694ed15f90a234e0/62721712554.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82949cd8a2---89283069508.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fd8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD8A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000115a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115A1	10976 bytes
SHA-256: `d41166be6728ba348976472a289e45ae7cd8357eabea157b6742f360bb9fa935`
`font_02_sfnt_off00012e57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E57	18012 bytes
SHA-256: `151590aa081a89f9099c47d75bc71472228f13e73a013133501faf37acf8242a`

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