Malicious PDF — malware analysis report

Static analysis result for SHA-256 6374102571ee3052…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 18:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b77763f059beba5815d1fb41efec386b SHA-1: 3d4cf1e031e767a9b68cc7f1390c9c7a6a75c420 SHA-256: 6374102571ee30520e8548981e7b1c99948d4db5a4e0bc15367c627e27412e2e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://aerotechgroup.ru/img/outer/files/95067460063.pdf In PDF document text
    • http://jevades.com/aircraft/fckimages/file/wuxenodabogotekiwuduz.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/21036546336.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160801c51c12d7---75661616519.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/deminugazexame.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca57f498ffc---35814262253.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608007e64aac6---katevajo.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/73541792525.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6c621f66---9053517731.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/60071040774.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089227f5e802---vefesej.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b261ec0e6ba8e491f3013527520c80ec/nagawakowuvonun.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/sipirofikiwegeravefu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075611a16812---genefotanop.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8e8f487a5714762066589226d7f899fc/80470232582.pdfIn PDF document text
    • https://ancoraeducacion.com/images/28515450012.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/felutawonajijusojewan.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97645231275.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41341a19---9922823672.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/208211682.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210704071241617215gleo9t.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/a7282fcff33f5200b337701c871b970c/xuwezuduneme.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pojoralarinivowikak.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/44767880642.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/91816599716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sideload+channel+launcher+2+apk+modPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011cf5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CF5 18840 bytes
SHA-256: 15d12cf9151abc74a9caba6ffd5733e7bd2e48e71957bf7580ee52fbb3a2c2f9
font_00_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 17272 bytes
SHA-256: 0cb81d500756990887ac2da47740124a209e112f12c4fd942d152908b4385f47
font_03_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 10900 bytes
SHA-256: bcb7fed78658fab0c2e48909f0473fe94e536a33610bdc5c6deb272dd7792575

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