PDF malware analysis — malicious · ff6e313eed870c5e

MALICIOUS

PDF

71.3 KB Created: 2021-09-23 00:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a0649ddd8b6c0e8625a2e66061310e53 SHA-1: b04afaadf0cac9f67e31cba4686a7bd826d0fe43 SHA-256: ff6e313eed870c5e8a7de60c1fa646e97d289ebf1bca539c71bbd8f69486bc54

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body is heavily obfuscated, but the heuristics indicate a phishing or malware distribution scheme.

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 https://synerhu.ru/uplcv?utm_term=gta+download+apk+offline PDF link annotation
- https://idealist.ro/userfiles/file/juxitoposaku.pdfIn PDF document text
- http://world-housing.jp/ckfinder/userfiles/files/linodaxumodixokesopeb.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-09-03/210903141614352077gsmbdo5ao3ow.pdfIn PDF document text
- https://mbbs.hr/files/22501052762.pdfIn PDF document text
- http://ohdiabo.net/images/ckeditor/files/wasajeruxumuvuvim.pdfIn PDF document text
- http://dglytbt.com/upfolder/e/files/20210904180017.pdfIn PDF document text
- http://iaestedresden.de/userfiles/file/riralefakevemaxupulex.pdfIn PDF document text
- https://veneziashowroom.ro/app/webroot/files/userfiles/files/79357591892.pdfIn PDF document text
- http://hoclaixebinhthuan.com/upload/contentFile/file/semewemutewokarukoxu.pdfIn PDF document text
- https://polenhosting.com/calisma2/files/uploads/xoxubawusesajabegakuni.pdfIn PDF document text
- http://fotosvatba.net/userfiles/file/99879044823.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/28392760553.pdfIn PDF document text
- https://mar3ol.com/Files/files/58151919100.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161448fa706092---6350327128.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b254509487---tigimukikimegibiluvupefiz.pdfIn PDF document text
- https://bearings.vn/images/ckeditor/files/10307599297.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p0gro59nfm2oak831mabnt7pm6/rubuja.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/05335bae9c9b8292c322d6ca7b482fc1/81682050678.pdfIn PDF document text
- http://sandsflooring.co.uk/ckfinder/userfiles/files/20084596231.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rgf7b8lc0md3u6d57rdv0h201e/97478870439.pdfIn PDF document text
- http://avandcie-automation.com/ckfinder/userfiles/files/76072520937.pdfIn PDF document text
- https://camphacement.vn/upload/files/bamanub.pdfIn PDF document text
- http://rideabikenews.com/user_img/files/kuwatekikegipetiparedi.pdfIn PDF document text
- http://e1pl2.nazwa.pl/busy/fotki/file/32096542688.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_off0000b627.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB627	16280 bytes
SHA-256: `b9c514318e577ca8b23b364fbda998727da01c31e92d6c2b8505e4f162f154a9`
`font_01_sfnt_off0000dfea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFEA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f801.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF801	10440 bytes
SHA-256: `e3bdbcc680763271eff06d1517031f05b263b4e69796448eef7da0f4ffda72eb`

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