Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ae06a2985792dc…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 19:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 000aa17e7f9579a2672c8270895ecb1c SHA-1: e3f6f4c9f7a499ed32dad8d598a4cc7a7d95f47d SHA-256: 22ae06a2985792dcd78f5861f89f9f2ca192836449cfb7ffa4ce607e5e4a253f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of an embedded JavaScript stream further supports the possibility of malicious scripting, likely used to facilitate the redirection or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=sekonic+studio+deluxe+ii+l-398m+manual PDF link annotation
    • https://vinadesigndanang.vn/uploads/image/files/deribisezejun.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/158a96d255b2f27877bb46529806c148/rewekebuguken.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a773ef8e03a---45692550899.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dapisi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3945b698c---30810199706.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/66153714568.pdfIn PDF document text
    • https://derfo.info/resimler/files/13505927400.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/8602611700.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/682501611.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082501c5b54f---gomubu.pdfIn PDF document text
    • http://erimti.com/userfiles/file/82569079799.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c006e2165a2---tuwadatogefutumisi.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/badelogejuvab.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa63a26bf---96082220242.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/bebugikuvumikozejobubug.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210517/file/16212430398520.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/77624171794.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c9be441c---fukubabor.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/88851351839.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/31fe4f7ea9680ebcad414b14f1b17ed8/foluxinafojakewaposoku.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4ac0cdcc---dumejuvepenolebum.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0c7d9549e---jewinaxejikusisudimep.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/75135622490.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tk0vscfa8iuk4qlig1400jkart/kodufujifamitulepol.pdfIn PDF document text
    • http://fitviewer.biz/files/file/19036533685.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.

FilenameKindSourceSize
font_00_sfnt_off0000bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 11380 bytes
SHA-256: b9071f708893c534516f0a4ad8aaa0545b2a5bc7178729e8846f11be67c593d8
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 17440 bytes
SHA-256: c5e9b44e0f749cbbab55cf1f1f0d17e56543f2beeed647aa7d7cca8fe37f81b7

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