Malicious PDF — malware analysis report

Static analysis result for SHA-256 13714b9f21b4b94c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 21:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00de86ec4bac14166b195b68fecb9c74 SHA-1: 6ee6dbc2bc16cb4f236e0a0eb47f95d7ead72ac8 SHA-256: 13714b9f21b4b94cd2c5fb02728caff98a7079c272589f775727f25319c6c092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting an attempt to leverage SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=biograf%C3%ADa+de+jean+piaget+pdf PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97307b48cf---66489895695.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/siladajarelozoxeka.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/detesirejetolijevudaxor.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/zajibewiretupezuj.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0888d8b3---68977228561.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/8024327328.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cd4cb201235---63034011676.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c229b7c91af---fetemam.pdfIn PDF document text
    • https://patc.fr/imagesfile/kulofoxewagikefepozejales.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7e4i2i5h7s0d0609env6urj2mg/71505889463.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/75093892669.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/28515338334.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jopedenuxul.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/86685615004.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9a933e77f176f7af623e2b3d06f18dda/ximarenek.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ff059962---3299095942.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a9f9dd26---bajebitefugowefesokowo.pdfIn PDF document text
    • http://waterreducer.cn/d/files/begidip.pdfIn PDF document text
    • https://edgecs.com/documents/kirevugujoxejakaku.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1d44138ed440ff33b043559ab3e21780/25743533115.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/93834063302.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_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 10704 bytes
SHA-256: 5b44b18fdf1915d1b82029b1f6d752acef32963fef3b023873965b1fe5149cb8
font_01_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 18844 bytes
SHA-256: e53823415d7f21ba0831dba800069a13aed0970a4984345270ff2a22262751aa
font_02_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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