Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b416847326b1f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 03:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64f1723ec23504e119e996be30bf75bc SHA-1: b78110ad3e0a9f40370daeeb88fabdadc56be71c SHA-256: 450b416847326b1fb114afe0f8dcc19bdec486c8f63caaef170425d5f0cb5428
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=fake+book+pdf PDF link annotation
    • http://macabrey-luthier.fr/data/Files/31055999140.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd92eee3d0---72994868442.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3f6d2b066---17429782670.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/75427049554.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dtbq879rnur63g9f4su5rl0c3k/1304197890.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/diwisadejaxuxosujebev.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16096875b17700---32835527516.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/2330706731.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/73267810325.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/xujut.pdfIn PDF document text
    • http://unityproductions.com/upload/files/sukumopedegom.pdfIn PDF document text
    • http://ranchobg.com/img/file/17026825917.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/974155472.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5e29bd315bc57f1e371a9b8d238f5b3c/62358605786.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/72146343957.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a726c2e9ebec64c99012e7479fd3976e/14777224305.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/321551848.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/13828361102.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16115d55762629---bibuwesa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d568cf803---mikovebusepivopiw.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a678b1f3---maxarukipi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ba444f41f447b002c89e8dbbff30c4a/93560318899.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zerek.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1e91e28531d0dc4eb912a623bd2cbd9/dekudimomoxobadorawidu.pdfIn PDF document text
    • https://cape-electronics.com/media/file/zovelonewo.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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 18080 bytes
SHA-256: f95ef8d00bfafe82ff96ba5a6045cc9cbbbff6100615d2091caca0956948db37
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 10092 bytes
SHA-256: b8d10569a06c11d57e9648071f8de7f3c157b21314993ef18cf4eeaa65415e94

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