PDF malware analysis — malicious · 54095e369f7f6120

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 09:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 33833797f638af06f74752416ab6063e SHA-1: 888ad000fa64a38d629489ad0414826278d76758 SHA-256: 54095e369f7f6120745355d4c774d2db6b57cb795a606094139a37d84fcd01ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution lure. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092828e8f5e8---29005416475.pdf In PDF document text
- https://implant-drill.com/userfiles/file/58571165616.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/77a27f7dd423db3315aa8ccc7c576877/74735730553.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e6891998---67508333633.pdfIn PDF document text
- https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/uhpf0iaa5rllo2jtmtfjko8t4i/rekejipuraf.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6aa64fcd---17819257169.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bafffe6ea32efb8c7d8ef86bf0135c1b/1422238466.pdfIn PDF document text
- http://mywymc.com/userfiles/file/sikifugikevidikexozu.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109fff477cb0---92625130199.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607055303ea6a---waxomuxebaxele.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f536395852a3bd72e703dfeca42b7627/58539324523.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827d6aa1d3d---75529828282.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2f4301dda318e6403d240e14b675ea42/jasitofisefagisupometafax.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ac250c72a59b507ed73bbe062dc2fd4/68969364504.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/81358906014.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb31df588---17381524007.pdfIn PDF document text
- http://doubles301.jp/files/ckeditor/files/gevowe.pdfIn PDF document text
- https://bursakaynak.net/userfiles/file/diropovalonuzuve.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85726242f---90176830448.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/96863415622.pdfIn PDF document text
- https://scavilecis.it/userfiles/file/84660399982.pdfIn PDF document text
- http://signexpowholesale.com/project-new/christianbook/upload_images/file/7395849869.pdfIn PDF document text
- https://silga.ca/userfiles/file/bevubarumowefodid.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b6546f5---76382111142.pdfIn PDF document text
- http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f3141eca---306906543.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=employee+evaluation+comments+initiativePDF 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_off0000de5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f672.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF672	10696 bytes
SHA-256: `dbf6fa90960da0c2f04b8fcf508194145716d031c5b2c5871e76c4010cfe0bb3`
`font_02_sfnt_off00010f01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F01	17180 bytes
SHA-256: `f80d67ad462013ebb6025f9279b47d102d6f89755271d8900cd6510c01e72144`

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