Malicious PDF — malware analysis report

Static analysis result for SHA-256 89eaabff4022fc0e…

MALICIOUS

PDF

111.0 KB Created: 2021-08-10 12:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4468dafd7f4950df677201e98fbb9f1a SHA-1: b8df2aedfee2ddb13b441037da66878b59520838 SHA-256: 89eaabff4022fc0e6c840c98227e7332ca62fc91fc83c0f075dd0e0b60c55871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to these compromised sites, likely for further phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab6998b54---dodusadebefalefufel.pdf In PDF document text
    • https://prestinieurope.ch/userfiles/files/60642885426.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc1d01f8a---56260352337.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/22776354120.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb519db35---68311411439.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/96295503417.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9n9onog0d3r0ec08oivv1tiqs8/14845003281.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/gejiginubugovupuvuzade.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/98740023760.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ne8t8j3srrj0lrakkqvok8r94/nelefusovised.pdfIn PDF document text
    • http://rs-entp.com/upload/file/45916099236.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/xelenozose.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25db13970---50959564922.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f627a937b---jatamimal.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/48252398292.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81775931703.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af5cc9c02---64984874596.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/i8sd851e04m914lpspaq93cjhu/97934178672.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/zakovukobujomamex.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfb779351---vofelovili.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/mawelewuradaxa.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/liwopitesanifelodobu.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogekonigus.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/96348489389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+song+achyutam+keshavam+krishna+damodaram+by+vikram+hazraPDF 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
font_00_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 20476 bytes
SHA-256: f017781195f3c71a8ebe2e47edd5c1d1f0d012652e3e906647fbaa304f3fb339
font_01_sfnt_off0001626e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626E 11476 bytes
SHA-256: 6c195c3921731bd53c0ad6da1a74cca9ac281e38639d209128bbfa41d5abedc0
font_02_sfnt_off00017d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001955b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1955B 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f

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