PDF malware analysis — malicious · b48b49b4308f1ef2

MALICIOUS

PDF

85.7 KB Created: 2021-08-23 16:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f68692d0ceab072696be40862d16ba03 SHA-1: 480f5b3a91bb8a8b6bcff66daa41d33e0eaac8cf SHA-256: b48b49b4308f1ef2cf4d259c9cacfd5b14521f98844b4f8b2e1409e2ad2064fe

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript stream suggests potential for further malicious actions, such as redirecting users to phishing sites or downloading additional payloads. The numerous external URLs, many hosted on potentially compromised or disposable domains, reinforce the phishing and malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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 http://www.startservis.sk/novy/ckfinder/userfiles/files/72241601556.pdf In PDF document text
- https://silverlabpupsforsale.com/userfiles/files/kemusar.pdfIn PDF document text
- http://naasschoolofmotoring.com/fckeditor/userfiles/file/wotofefefizuf.pdfIn PDF document text
- https://guptajimarriagebureau.com/userfiles/file/lagav.pdfIn PDF document text
- https://mimpiindah168.com/contents//files/poxevijinimafin.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/4081192230.pdfIn PDF document text
- http://bugaboo-buffalo.eu/UserFiles/File/5939467910.pdfIn PDF document text
- http://2ds-creations.fr/userfiles/file/12415698051.pdfIn PDF document text
- https://www.nevjegykiraly.hu/userfiles/files/rugifanitozanejeromopetib.pdfIn PDF document text
- http://canadanur.com/resimler/files/84244478045.pdfIn PDF document text
- http://standartbio.com/fckfiles/file/pukirazomorimijikebak.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec70c2dc88---gulojerixemifo.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b5c5aa73289b42a205c2d3fa3deaa12/rixija.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bctjeg9ue7hqtasdq93kv0afv0/61593146499.pdfIn PDF document text
- https://minervatech.work/js/ckfinder/userfiles/files/nejafekazugakitif.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3835ce4059d23eaf38321354e17aa12/bigikuzikotilokevivu.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80721420c---govemuvikugusilegizewexob.pdfIn PDF document text
- http://www.leasebridge.com/CKUPimg/files/16677505465.pdfIn PDF document text
- https://rmp-traueranzeigen.de/cms/files/rifomejoneretuk.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3250680167---puzefumupepul.pdfIn PDF document text
- http://clinicaveterinariailmarzocco.it/userfiles/files/1533637574.pdfIn PDF document text
- http://www.parkwaytransplant.com/media_upload/upload/files/xipimamufaxeberujokigigo.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/94741847069.pdfIn PDF document text
- http://dichvuhangngay.vn/uploads/image/files/sijeluminopezotejigisovuw.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=strengths+perspective+examplesPDF 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_off0000e88f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE88F	17164 bytes
SHA-256: `68912d9a19ebdbdbf65ed4543c8e6103f73cd1c3eab551244f61c791a4fac9a1`
`font_01_sfnt_off0001153d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1153D	10944 bytes
SHA-256: `f159ce040a1e8e467aec0dbf654434443d9588b3469ca191c4d8cf52c39f5635`
`font_02_sfnt_off00012e76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E76	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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