PDF malware analysis — malicious · 6bc5660648f5a229

MALICIOUS

PDF

70.1 KB Created: 2021-09-04 04:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fcd40ff86919ffd26231d682168d0a4d SHA-1: 044bd494f92311e513a56c3e5baf99d642f5e046 SHA-256: 6bc5660648f5a229c8870ee214b14c2b8e342cb0f4296265a71406159d88bc85

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://huntic.ru/uplcv?utm_term=idealist+theory+pdf PDF link annotation
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5a828df95fdb36353a0a2ea7bd117054/6972532888.pdfIn PDF document text
- http://17njl.com/userfiles/files/mufawavatalusaregomevepo.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da73685f13---pevax.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1d774341c---50498767576.pdfIn PDF document text
- http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0eb074f6---fitotagizuguwegaluf.pdfIn PDF document text
- http://yonseri.org/userfiles/files/rudoginudamuxax.pdfIn PDF document text
- http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/9162685708.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/vibunitupexosi.pdfIn PDF document text
- http://jamalcar.com/userfiles/file/43572836636.pdfIn PDF document text
- http://train-in-japan.com/images/blog/file/80226244484.pdfIn PDF document text
- https://sanvexe.vn/webroot/img/files/84659879844.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/240908974.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/jegenapasipunixifoleli.pdfIn PDF document text
- http://hanleyresources.com/images/nazelori.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/37476294058.pdfIn PDF document text
- https://cmoretv.com/userfiles/fumovosu.pdfIn PDF document text
- http://www.fdconsult.qa/public/uploads/cms_files/79216278062.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/buzogaleniwoteme.pdfIn PDF document text
- https://mariellatriolo.it/public/file/96617583167.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7aa22903f29b3ed490040ec09b97188e/55568950231.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6kd07u9si3j9ajf0s6k94hioqq/wonave.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/gipunesakota.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8ed121bad7ed3b95c4931356e80c3a06/wukumofepimilivovij.pdfIn PDF document text
- http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mevenegemi.pdfIn PDF document text
- http://komputerzagrosze.pl/userfiles/file/3462342264.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_off0000b55a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB55A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD71	10556 bytes
SHA-256: `5e6669135a2eaef6a94d65d2c03b91c98fccb8a884cefb94b8465e429da3a856`
`font_02_sfnt_off0000e5a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A5	15236 bytes
SHA-256: `eccf9b4b224f716ac5d486e52668c4ec178943d69526b15fafd55add4a593513`

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