PDF malware analysis — malicious · 8f8efdd535502339

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 18:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 3028bbad1bf5d3e80dea610e38b4f222 SHA-1: ef75739b03cc7b4648fb2bfb6538d9d482905eff SHA-256: 8f8efdd535502339de6d467947747243519487748de9e82d87cd9c70a03a26e6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vgg5k15nadhgb3dgv9a4o0j3h0/modemidama.pdf In PDF document text
- http://cutskytools.com/d/files/wiwekamapufulewa.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf6983b9---27681078983.pdfIn PDF document text
- http://electronicaindex.nl/images/uploads/vituzepilipusoxeris.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6afc96ae713d12a3a8d6e5485eb337bb/bawonirozuzalubupi.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/isnadufjdb1gdm44rgrpuml0k4/zanivakibavu.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/vipodisage.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d69d907d---3097146561.pdfIn PDF document text
- https://il-gusto.com/images/file/kolivuriwagulubugifido.pdfIn PDF document text
- http://atreve.eu/ubezpiecz/obrazy/file/sinolurunezitafubu.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ad0e262b6dc0a0545a86911229c7f020/kisexesox.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008f0621465---sovunofadaxobij.pdfIn PDF document text
- http://kengosushionlineorder.com/uploads/files/5076793874.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae870a61890---dazubivosakepitoxil.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd56e1836b---rapowatigumijelepedat.pdfIn PDF document text
- http://mispuntossaga.com/campannas/file/7564038315.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6c4e23296d8e42aff3fe023131478a10/34801658960.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bab589ad5---56371570199.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076926b0a166---59421839132.pdfIn PDF document text
- http://speakingaboutnetworking.com/ckfinder/userfiles/files/55233720816.pdfIn PDF document text
- https://digireg.se/upload/zepazef.pdfIn PDF document text
- http://metrominicabs.com/survey/userfiles/files/maxuwoxemabonoba.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2013f456---xunudubesikerano.pdfIn PDF document text
- http://agendatourvietnam.com/hinhanh/file/64044866708.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=swf+book+to+pdfPDF 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_off0000dc53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC53	10080 bytes
SHA-256: `2c5aa581b6328dcbe7d1424850d7b3b20f3a093a6a095350c103b4706ba08234`
`font_01_sfnt_off0000f2c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ad7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AD7	23716 bytes
SHA-256: `45238f0599820aa811b97913bc1d8c5b72823ad325dcbffb75161773a7e4d4ad`

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