PDF malware analysis — malicious · 1f59db529ce07a80

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 09:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 68d7f77da0c6d042e7cdcdc7b652f4ea SHA-1: ccfe4c96852ae5b09882206cd18fde37432c1ec1 SHA-256: 1f59db529ce07a803f9b12aa28fc0f11e88575a697821348f054ef2c363852ec

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be47cefede---15963268963.pdf In PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/91b678bef0c79724660c6142cafdae98/58756856206.pdfIn PDF document text
- http://alfadent-volg.ru/images_uploads/files/87335399083.pdfIn PDF document text
- http://alkanboya.com/files/file///80342807097.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf355a3bfb---tufejubufop.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7cbb0a461---5659657432.pdfIn PDF document text
- http://www.motionmantra.com/userfiles/files/74813172503.pdfIn PDF document text
- http://colantuono.it/userfiles/files/pabetugoligimujixi.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6908fe6450023efbe8d8ecb8f4f0017a/93076648049.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f9577fc5---70161679344.pdfIn PDF document text
- http://hjtech.org/admin/upfile/file/fejixizekar.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b78e52236a4---sonazubogavudaj.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u0lb30hs8turm2kcqat2v19fvp/8371594113.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/edf8f9504924b925a5e1027543aa2c9d/26967740212.pdfIn PDF document text
- http://gdbchurch.com/clients/43262/File/44536472821.pdfIn PDF document text
- https://torbay.ru/images/uploads/file/piworemukup.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16114c0ba3995e---4000201847.pdfIn PDF document text
- https://bleikss.com/userfiles/file/begoxasitiwinalekimojumub.pdfIn PDF document text
- http://meimagedance.tw/ufiles/files/50030414441.pdfIn PDF document text
- https://leanuslab.com/UserFiles/file/dimezos.pdfIn PDF document text
- https://parc-hotel.info/file/mevamobetibiz.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c8e37237fede876b85f3c24e3e136ad7/dugiwesugasobosuzijekuz.pdfIn PDF document text
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/4r6d7q7didfshk4vbgsrc4nrll/zolilowewemomasisi.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114882783ae4---zakepilelowamomokapox.pdfIn PDF document text
- https://ilexgold.com/app/webroot/files/userfiles/files/zasumatemafedunafipux.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e49a99bdb---77049019408.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/1368978495.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=difficult+question+answerPDF 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_off0000ea01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA01	10660 bytes
SHA-256: `9da5c4aae7c4df17e1614351437e016b2bf2bf920d1451bcfd4467063d7e0a93`
`font_01_sfnt_off000102a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ab9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB9	17772 bytes
SHA-256: `630ec1f2ea3d7898e16fce6c4f2794ab72e1aa82ea8e7c3190f760c5bc2e8a20`

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