Malicious PDF — malware analysis report

Static analysis result for SHA-256 720b352572f9672a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 06:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 235219ced5891564df8fb3a85a6ef39c SHA-1: 5494d6970e8c0ef6fd2fcd8bf0faca0feacd6acf SHA-256: 720b352572f9672adf704b7d9899183f77e9ffa30c5ddaf3a3b86576167df810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the URLs and the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abe289080---27975507285.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90de5616ea---22200915949.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ef2daa9a92bce758da8a4edf589f33c1/56344237607.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a30180c8d---zakuz.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/gexerozowopopumugifovu.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/ptg9ekao0s9v01kk6lrplgv70q/kixuxukaturoratixotezog.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/gibonikunitonodokesel.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/delj8pl1ld085sitmr55ics303/61921008571.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/99353297329.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/32468412945.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04c69fd2c---40700823623.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9hlf0omm9tlj3aj2pe0hsrg2d2/84679003571.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/gukewipoduruxufusosuvuno.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/9352051985.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/89e4b01196204f396d66ad84264e4096/94190911429.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160835275d87e3---porufu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb67267ba2---38591778855.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad25df027f2---saweretikisutikobuzolijan.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c734eee8---89366122168.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/gdqljdt4ocugljg2cuamr07um3/zanigaw.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kulewipa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abeb567b5---tixubujovifufipute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=security+plus+federal+credit+union+northern+parkwayPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 11184 bytes
SHA-256: 34af69e1cc441d6d03f3286d4b83d78ce8d8c3125af633adeb31dfd33790322b
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 17336 bytes
SHA-256: 13bd1fb9da96bdda3a1dd96ce48be35cf35ba70bbc2d4754ccaeaf956cf4645b
font_02_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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