Malicious PDF — malware analysis report

Static analysis result for SHA-256 5558fcb1bf8769dd…

MALICIOUS

PDF

91.9 KB Created: 2021-06-26 20:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3100fac0c792df4e3f826587179852f SHA-1: bd11d5beb7eee4aff088abb135b3a82e616f28d8 SHA-256: 5558fcb1bf8769dd7eca53928193cb4c47fb615c99bd53be9bd8ebab30c440e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely leveraging T1059.007 (JavaScript) for exploitation within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a5368048da6df723502e6a333e84e9d/12271947439.pdf In PDF document text
    • https://nepalimodelagency.com/userfiles/file/64818432481.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa8b0fe20---71297982629.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798d377b9d6---47502500986.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/eqjvjj4t8en67vfutc7nl3hak2/43247246568.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1134b17512---94564109708.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081346809254---33741209957.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/kubagivos.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/69354409188.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/vajigilerevubuwutizuza.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c60fe7e0a3d---vapogusegejigakaw.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c98e05633be4d1608d9947f6795ad4bd/xabagonizamuvivuwimoviri.pdfIn PDF document text
    • http://snsi.jp/image/news_file/zupekezemosizutepawodi.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/butaxumudinitipufura.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/14760228886.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u4ftnm8l2cbmpgbkc92au2imv0/buguwimix.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/modupesavezata.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec680a7698---8423943351.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/82379051075.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d37dd8ac9aef7a8419dc95fd0eaafb3a/resakofimugolup.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9afa6a7f30---libebaki.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/39127379236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=co+parenting+with+a+high+conflict+personPDF 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_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 16800 bytes
SHA-256: 688d12a8aca214f6340e3c7bf47fc72d93c182e679897eef4a25028140cc8963
font_01_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 10876 bytes
SHA-256: b5a9afd984f1ccbb23e00e6d13261dbc9c640f0523e990e5cd011a92efb95865
font_02_sfnt_off00014a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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