PDF malware analysis — malicious · 817ebeacbbfbde63

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 23:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 8869af8f0294ab2880c01169cb317970 SHA-1: 6ddc9bab198547583d7b2830a56cc78c61ecb5cc SHA-256: 817ebeacbbfbde637011b42a763dfceea94e0efe7d9050788b18a6c11fe6803a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for potentially deceptive purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=teenage+relationships+facts PDF link annotation
- https://fullhousetourism.com/UploadFiles/file/20210526143542109.pdfIn PDF document text
- https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/ludubakinu.pdfIn PDF document text
- https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e87e06bbd3ba5d10d71d4ad3cab2250c/pokomemalikipopel.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74655cb815---53133130549.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35cfc9712---waxupuxurotubefujoguj.pdfIn PDF document text
- http://ettermanenterprises.com/ckfinder/userfiles/files/jetitupemefo.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bacca69f---rasut.pdfIn PDF document text
- http://www.cenlajobinator.com/siteuploads/editorimg/file/75871105264.pdfIn PDF document text
- http://alphabodysupplements.com/newerac2c/userfiles/file/3111398231.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb10575d5---xabaluzeribevu.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4f929f8a---90535073189.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df9b2c053---86470305299.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a866d242ca---18625028486.pdfIn PDF document text
- https://ceccarbotosani.ro/userfiles/file/56151414180.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b339617ba45e912ccd9f38c6b5581543/60164466137.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ce4ecb24f5e225fa7086a2be30c2d31b/6403863723.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6746c217a---72257852111.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a463082c8c2---rexedixubepuzilez.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/jifofu.pdfIn PDF document text
- http://mazdooradda.com/userfiles/file/9718286608.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4377989230---91779173404.pdfIn PDF document text
- http://jrmhandling.nl/upload/file/pakovejivigulajepulebeke.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8aae22be5fd9595e162f8b66d582c9f9/25422729842.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rmfmf7lbv94obnje0879dfn70u/39395956280.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_off0000f3e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E6	16992 bytes
SHA-256: `61a0ad1c70dd1dc595afdeec3215d2df10402016ba3cb0cc2535ab258e74d811`
`font_01_sfnt_off00011f8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F8B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000137a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x137A2	10720 bytes
SHA-256: `4064ac28fcc5f70efe8123d3e77cd81cc6d221c200a076d18e816274bbc889bd`

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