PDF malware analysis — malicious · a60c408aac84ee41

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 15:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4d7b0a44b391b373716efe6fffc5d437 SHA-1: d57fecfc8782fcb7dd1c0ebe9977dda876e0ba75 SHA-256: a60c408aac84ee41183778fb3e637aefc0575bfcb0a2e6a907560d79be2f5bb7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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.
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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/89854361001f94bad445a5f231fb2627/tolixuzobaz.pdf In PDF document text
- http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/3276008308.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089633b5f90b---77055964453.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f974d4c176---larevunobosoxedenakamopan.pdfIn PDF document text
- http://tfh-filter.hu/_user/file/16409007453.pdfIn PDF document text
- https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7adc6b7bed72962ae135573e116ed4be/noronevemisorapebemaz.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e1410c1c8f5c2a7aa5a2b7999bd79d42/27312075268.pdfIn PDF document text
- https://wsbtitan.com/images/file/besominewabada.pdfIn PDF document text
- http://coinmarketsuite.com/ckfinder/userfiles/files/kowipifesesuvewotekenoki.pdfIn PDF document text
- https://pavimenti.pl/web/uploads/files/4531015766.pdfIn PDF document text
- http://zoop-tech.com/ckfinder/userfiles/files/karorabebitamuki.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37287944e---zeregezimaxo.pdfIn PDF document text
- http://assessmentinsight.com/ckfinder/userfiles/files/14185193575.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/49daa5ac8bb8002aa6cc25b49fceda8d/92850623765.pdfIn PDF document text
- http://www.kymkarajok.net/tiedostot/files/pivefetediraxawofa.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606db52a9b9b8---tazadoxutojetelaratida.pdfIn PDF document text
- https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a61f8426e9abfef1be3e1fb553af07cc/wufirokojisopake.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a6877f8de50db770f2ee7894a76612b1/6282149965.pdfIn PDF document text
- https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/koofd6tfk50khv8v7gs68r6oh4/95123920317.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b363dca0c---92793713888.pdfIn PDF document text
- https://hitourkorea.com/FileData/ckfinder/files/20210609_A3783F504A3E8BF0.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dde82f1bc---42662608066.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/37113783098.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1st6sivhj19j6nhp2irns0nm20/zuxusago.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/11b0a78ece3a8c8541d7b18ccbd99066/26029270876.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+software+to+convert+pdf+to+xmlPDF 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_off0000ecdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECDD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000104ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104EF	17172 bytes
SHA-256: `20540baaffa5cf0dac1f239e16ab952e0298ea58aeb51af2b2b789239fc8507a`
`font_02_sfnt_off000131db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131DB	10920 bytes
SHA-256: `fa3a7cea8e954043e19d68e8711876caf41d9d2a488f9c28d56887334a1a6229`

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