Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89941a3f5910ad3…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 05:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c06be6a7bfac4883c7c6476c8d00df33 SHA-1: 32278dcbc3723d800a15dcba93658b1fb10423b7 SHA-256: b89941a3f5910ad343d322ea32b916639409c90d2e364c7d2e1d24123aac6266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad277bee3---81589003885.pdf In PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3d702c83---jasejimenira.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7497799752---87006175564.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/26348804959.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9773812156.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e1cf06d46---mawix.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/rodaxe.pdfIn PDF document text
    • https://anjingliar.com/contents//files/xukifuwemoxitonogidalimod.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096943ef402b---32625265730.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e4dd8f6ff1579c9ee113b7228358dee8/80763669656.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/86239846670.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/90815529378.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/litesejudaramor.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/57583148947.pdfIn PDF document text
    • http://surtek.biz/image/files/20150128_214600.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/48600425347.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/53369734798.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/41742223679.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/37494516012.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d52c7f582---kitubixuzoke.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff9c1d5cd---56421019294.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc86714111---fuzumafoxo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/71d0e94df80a3fa9e5e1c939ddee614a/97223427370.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/naxejedefenipitoxiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+cancel+storage+subscriptionPDF 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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 17216 bytes
SHA-256: f53320bf586a38606112087f78476b91f301d1977a05a58f029fdf2da2577a96
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10868 bytes
SHA-256: 5973f275416d77f74e3c63c5eb9b96b3fc237d75ecea7504f85ae7be1fc55a46
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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