Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55747e85b6d4eb0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 15:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5cabda300f76b98d0a67ea3f22a6473 SHA-1: 713748ac2533646cbc846fe32e85aa61fa728024 SHA-256: e55747e85b6d4eb0dc65b2ccde101567e6528c43b27c0ae47afa5f53429cc159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=tows+matrix+%E0%B8%84%E0%B8%B7%E0%B8%AD+pdf PDF link annotation
    • http://abwlanham.com/uploads/files/11691983608.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abba4e5ee5---88755995956.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/mejeso.pdfIn PDF document text
    • http://effektfilm.de/files/file/saniz.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/32547087592.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/54516545793.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d94a8a573573dcd5fcdcf33fbdaa1e14/vudinorak.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/15/file/20210715_164615_167.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/2949683576.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a8i900sl3dkoflfi95hck951lk/21222010164.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/22609182961.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/78673585840.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b35ee2d4e6e---demubiwag.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607471b35e229---87398264325.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/fugorurimafivob.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/25082e20ca895f2895df8bed2618364c/jipofuketuwawagavapedoz.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/vujojer.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/21295876513.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/36099305137.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e441d6232ce---89875381831.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0d880482a2798f24ec1cb325bae984ef/59560345044.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/derixupadopitofofefot.pdfIn PDF document text
    • 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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 21080 bytes
SHA-256: 295ee7471c02b75d8ba36ffdc5da82c1ccc06ebf77332e077dd89418c3f14048
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_02_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10528 bytes
SHA-256: e991be01108fb64fd6cd78ff4393c8dc2db3bb70629e55f6e36135c4a29c6537

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