PDF malware analysis — malicious · 11afbac6b0d97c8c

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 18:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 09e18fbdd10364bf01963b4e15a5f51c SHA-1: 8560eb59b41a4282a7fe0a39dfea4cb4c7b0b898 SHA-256: 11afbac6b0d97c8caf4d1625c4b6158a9260d10a8c51389e074f5b47f4852b91

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or redirect users to phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69b3d6044---kevune.pdf In PDF document text
- http://polymer-optix.de/userfiles/file/sasagufaloju.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3af1bff6db630de6d759692e5db4e4a7/39568200328.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ba2016c0---21644659940.pdfIn PDF document text
- https://laznia-radom.pl/userfiles/file/35913406143.pdfIn PDF document text
- http://siripanyalamphun.com/user_img/files/letuluxenafofepejosub.pdfIn PDF document text
- http://resumesfromabove.com/userfiles/file/mibaguworejil.pdfIn PDF document text
- http://azstorestudio.com/uploads/files/medikuzikenanuzef.pdfIn PDF document text
- http://suurelepa.ee/data/file/32313056324.pdfIn PDF document text
- http://wirtrauenuns.ch/images/file/saripuduwogo.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/govoxurojofirowegilisajo.pdfIn PDF document text
- https://cheesykeju.com/contents/files/vodewotarewesus.pdfIn PDF document text
- https://imagebrandstudio.com/userfiles/file/zezuwamubupikugela.pdfIn PDF document text
- http://istanbulballoons.com/ckfinder/userfiles/files/gedibilevulajulelow.pdfIn PDF document text
- http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/dagakisexuwapurisutolitis.pdfIn PDF document text
- http://rtm-plus.com/ckfinder/userfiles/files/liwozakavusowif.pdfIn PDF document text
- http://intrinhgia.com/admin/webroot/upload/image/files/zudidabu.pdfIn PDF document text
- https://artinterior.bg/userfiles/file/zigaxufogofupotagem.pdfIn PDF document text
- http://headrepublic.pl/images/files/79562782021.pdfIn PDF document text
- http://chaodontuonglai.vn/uploads/ck_upload/files/xixemofojebus.pdfIn PDF document text
- http://savages.lu/imagesRTE/files/19508170759.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/gobujozufad.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cc72dd20---lidojowepenat.pdfIn PDF document text
- https://cfacgroup.com/uploads/FCK_files/file/61752450091.pdfIn PDF document text
- http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=comparatives+and+superlatives+exercises+pdf+primaryPDF 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_off0000c6b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6B1	17032 bytes
SHA-256: `57528f39a117aa480f6a2ce29c722838f7e4407f8ce9c043e626d5279bdf8cb8`
`font_01_sfnt_off0000f1fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A13	11192 bytes
SHA-256: `357f35eaf9db61218be5b2bf8da6de1c767eca58102bddbe28a626e65039b9cb`

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