Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b989573ae82cb…

MALICIOUS

PDF

94.0 KB Created: 2021-10-07 08:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84baf610ce8591cc773dd4871209a98d SHA-1: 79fb4c4619805bc32d8ea01b943894933ea5a749 SHA-256: c52b989573ae82cbd06e0a4982606476b36facb3df51fab660ceee3fbeb41de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=example+of+inter+caste+marriage PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403eca0774---tavuralakibunafapiza.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/kikofexevezomoditapu.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/59974621960.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/wadapagirikazaduge.pdfIn PDF document text
    • https://clinicscrm.com/img/files/3538962271.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/pifijotakituloliwemog.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd27bd4c94---jowudemileroburowupopus.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/wopiwefowogenopubemo.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/161589bfddf08a---53342492912.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/78410070597.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021910103785206.pdfIn PDF document text
    • https://southafricapools.com/contents/files/rupopekejoduxediguganoju.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/natulekejorufogewakuge.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/xikezawubekejufojako.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/watot.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/72495494858.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/nulasemulipuz.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1615e45772a48b---82931668908.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/pineririsadalalinibewuke.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/biwap.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/30606113184.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210901_A12F8693CB4E2FCC.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c88f06cde5---73297246714.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/lekujanuxurebanebejinefan.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/fitiwejuvomiwez.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_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 20872 bytes
SHA-256: 46bac8d148d76499301fa4f98a3c94f866747737cc87539e9f12c9b263b1d5a5
font_01_sfnt_off000138b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 10908 bytes
SHA-256: 91b152a6387f7c1efec6a8514589c268a721af239f0914e4cf2fd0ca86316f28
font_02_sfnt_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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