PDF malware analysis — malicious · e50e6fd13a8a7b89

MALICIOUS

PDF

93.9 KB Created: 2021-08-01 02:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 473a3f35c6cb4685c8b525600fb35c50 SHA-1: b6885647837a0836b125df400957bbcb7555e1c9 SHA-256: e50e6fd13a8a7b89e7fb51bbc439e7aa61ca903cf27fca7c1b1d6f805dd7f7cf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other disposable domains, likely serving as a lure for users to download further malicious content. The presence of a visual download button further supports the phishing pretext.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://cructi.ru/uplcv?utm_term=how+to+setup+epson+l355+wifi+windows+10 PDF link annotation
- http://yuha.be/_files/file/63262559919.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ecb2c29ee---24764618342.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/69404879290.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ed951a87bf1eb9f9935b5b153168e19/93313382891.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c34b6a104c2f1a0cf3073d2e0a800659/sitowuwiduwulokutig.pdfIn PDF document text
- http://csc0351.com/userfiles/file/20210702020850_7sm5tb.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ab16c73652a128adc655e06b4642993c/xixunufemimenomelagiris.pdfIn PDF document text
- http://albertopizzetti.it/userfiles/files/dokevibakubesidaruf.pdfIn PDF document text
- https://detmers-kontejner.hr/files/22413206528.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/bf21ec1de6e9016aef5ded7f063575bf/25828603862.pdfIn PDF document text
- http://xn--j1aii.su/userfiles/file/10321243788.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/gagesidesitodexasos.pdfIn PDF document text
- http://houstontca.org/Content/uploads/files/kasuvotizigon.pdfIn PDF document text
- http://bielwod.com/userfiles/file/5864501316.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e63d50e3cc6bfe48d7d66c0377e268ca/94112632381.pdfIn PDF document text
- http://vhshf.de/File/2014921694.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d68a4b03c---fuxumav.pdfIn PDF document text
- http://shqinze.net/admin/upimg/file///43910115500.pdfIn PDF document text
- http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/3577714407.pdfIn PDF document text
- https://abofahed.com/userfiles/file/28370485091.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77cada6349---59263927156.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/usr15b4e2ja55k1otpkfejm4e4/28656617287.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e1ada848ce34980d5bc45c276e331690/47557890873.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/46940025249.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e52bce7bb---43007164711.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF5C	10884 bytes
SHA-256: `bc97943edf3ba68e1e2cbc2c965fa2b670d55766f64feeed6bd87bd4ea21d6a5`
`font_01_sfnt_off000108bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108BC	18904 bytes
SHA-256: `3ac28bb0d0a3909cde87210a24fe69c304e658a2664c2e33d46a07cc8c46a604`
`font_02_sfnt_off0001387e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1387E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001508f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1508F	16448 bytes
SHA-256: `0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878`

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