Malicious PDF — malware analysis report

Static analysis result for SHA-256 7053326ab2f145fe…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 09:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b7480fa01cd06343b45e726b3bf6192 SHA-1: 38f23b3f180833a6e0611407b9386a40840cd49a SHA-256: 7053326ab2f145fe6d2e8f83192b24a9df7c7ab45f082b31e714b53f170bf4ce
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The embedded JavaScript likely serves to initiate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://archism.ru/uplcv?utm_term=air+pollution+water+pollution PDF link annotation
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xafosunu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/19801016058.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/zemiroramivez.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6b24bea0136e328033bda34cd384d012/71049266062.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/wejejixenafanusol.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/vujufaj.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d959a947a01---15187200828.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xowawolobonisodor.pdfIn PDF document text
    • https://alutat.com/data/file/demimusikevojuj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b293a9815---1795279232.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/vidujesisudufugil.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79ae1a01ed---takefuma.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/xugavukav.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4fb07f4661905d543d79fde306de9ae/2559076929.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160dccd9446987---13678465368.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e52b7494---54814691039.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102b286578ec---tebuduvapagevikuroz.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xajilonikorijedadarix.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/46180919424.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/wufalogomese.pdfIn PDF document text
    • http://tetedebois.it/admin/file/popekawadalozufuzu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4a5d96a502472ceef0b52c68f16b5da6/tobikewadabamesekopurej.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/c2763175564143b2e35e54f7f70367a7/zevonu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/tepavexapesan.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b83d0dae23---romijos.pdfIn PDF document text
    • https://medlineplus.gov/waterpollution.htmlIn 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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10244 bytes
SHA-256: c8df2013a7b8b4d5a5a6907915977956b8adb63a5e6e1f6b24abff2404060065
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 17136 bytes
SHA-256: c8bf3bd0c8ea4f0e92fd6826669272eb64633522209729f7b74de2c7533e933a