Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bc0e9c12215b2c…

MALICIOUS

PDF

310.5 KB Created: 2021-07-02 09:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8441000987262858fbda050e652834a6 SHA-1: 975357a4dfa7a1a8de15f784ef25c8c7bac85a48 SHA-256: 41bc0e9c12215b2c811199c8d5c0aac0456d86177cecf10a6d6a25c073208e7e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to compromised WordPress upload directories, suggesting it is part of a phishing campaign. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates an image lure linking to an SEO redirector, likely for distributing malware or conducting phishing. While no scripts were directly extracted, the presence of numerous suspicious URLs and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073081b9dbc8---gukerowulugem.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/996631e0a25635f079ed135cbcf69a2e/78059702610.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/mugipabosetikuj.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ra525nmkr9kklu4dgs6ne2sau/jixuvepoguz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sf9osoqhha5ua0h7nu7g763d36/64751986325.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086830990996---58160361824.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a283f2821e---rijiwevezolefiti.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607646d51f710---tutitujedajalopasumuz.pdfIn PDF document text
    • http://orrizon.ru/images/file/mulojeje.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/ralufat.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7466ae2497ae8eda98d8749c239273cb/tedebulekoxizovilap.pdfIn PDF document text
    • http://www.toptehnik.si/images/18770404268.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/170962960.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4k8h9452bpms3ilgbsjubmm11/40016962343.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512180427980086.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074314f4d389---70007479588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5dcea1d04---vezolizizafup.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/etmi14dpvblnluhniv0oovubl6/pabidebeluziwilitezap.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/zisalolatitar.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1173f323---sinanes.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/272bfbf0aacdec0194dbff65555cd53a/lomenam.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hm5s5thiq770a6ieaq1t23qpqq/vujoser.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigafirefudagep.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3084f55a---23225856563.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1d2iggavlpakirbejtif56lq1u/68074652859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+film+ghost+in+the+shellPDF 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_off0004502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4502C 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0004583f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4583F 25680 bytes
SHA-256: 607ac6a47671cf617578cb217213f5d5aa1020048829339456a29c07e8c8ac92
font_02_sfnt_off000498a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x498A4 10788 bytes
SHA-256: cf0a217a81f6653087da1338136c18d0325a904468da65dad112d4a5ecc42770
font_03_sfnt_off0004b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1