PDF malware analysis — malicious · 5cf229c49ea5fb03

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 12:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: aa43a8a208e82fa3c55fd93a05822c35 SHA-1: 872a5512e0477095efd9bfc26b61f71e682aba75 SHA-256: 5cf229c49ea5fb0393fe43ab892690941bc1f347d361149e5f8c9db28d64cfab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable domains, suggesting an intent to lure users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

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.
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://oniceh.ru/uplcv?utm_term=download+hack+app+data+pro PDF link annotation
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765c7dceb1---nolas.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/38c24a9c0559faa125e1a7e6465d0421/37651093566.pdfIn PDF document text
- https://darshanam.com/ckfinder/userfiles/files/gidazidositawesodizat.pdfIn PDF document text
- https://asmitahrgroup.com/ckfinder/userfiles/files/makerosawitikase.pdfIn PDF document text
- https://textmakareknutsson.se/upload/image/vopugavev.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/pesiduwatemixadazetor.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0ad03299---vidubevufisubonalolojitor.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6e0f10ef---62480751154.pdfIn PDF document text
- http://avvolodin.ru/upload/file/simominugavejixadunafoli.pdfIn PDF document text
- https://artlabjo.com/userfiles/file/40919451809.pdfIn PDF document text
- https://rakowka.pl/userfiles/file/37067932180.pdfIn PDF document text
- http://jplus-ag.com/upload/files/BodyFile__6130337ED07C6.pdfIn PDF document text
- http://appartenvue.net/appart/upload/images/77253440035.pdfIn PDF document text
- http://mvpbuilding.com/userfiles/file/tapewa.pdfIn PDF document text
- http://dungculamdep.com/fckeditor_userfiles/file/82186801369.pdfIn PDF document text
- http://www.darvidproperty.com/news/file/zekovozugupe.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9262447b---noxovilexixusawegokomi.pdfIn PDF document text
- http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/2867985870.pdfIn PDF document text
- https://kujainspectors.com/candyticket/uploads/page_images/files/vubunaten.pdfIn PDF document text
- http://hp-cnc.de/uploads/files/ditigukujunov.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ee10edea5ae42a0008fd6c0281ee0356/95592157077.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/de48958d2f778901c1866d3b7ac89d62/dujonobojopifubikezasa.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06daaec6c---14476009861.pdfIn PDF document text
- http://omegapizza.net/uploads/files/33290663214.pdfIn PDF document text
- http://ags-sib.ru/ckfinder/userfiles/files/pumefofit.pdfIn PDF document text
- http://suliaox.com/v15/Upload/file/202199233779608.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_off0000eb25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB25	10396 bytes
SHA-256: `c810a16e140357701cd71f66248f38fe5d951b104eab469cc26aafca5ac41f23`
`font_01_sfnt_off000102a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A3	18880 bytes
SHA-256: `fe68fe33163a4576b37876d5335edc15508d0edf6fd896917a58f419114e27ca`
`font_02_sfnt_off000133cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133CF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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