Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebf632317224a22…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 22:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5249569cd7aa83114b49828eb0f657f7 SHA-1: 3973a3440ed0b540a53dd35c260c1cf7681b04d7 SHA-256: 3ebf632317224a22524d24da9c0d5dec4c200202f0a564d166a42fc85745dc28
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of these links suggests an attempt to drive traffic for SEO purposes or to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://skvely-kup.cz/files/file/85943703770.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b12e3b3d3---15150690230.pdfIn PDF document text
    • http://gdgom.com/upload/file/210627185855081681d2mw1ee6e1sb.pdfIn PDF document text
    • http://wenxuezj.com/images/File/16423349818.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210714114145_846681777.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/zetubarugagudojefu.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/12384828246.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847145a4c85---7888456470.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/gedavuxak.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/12136522093.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/99982616598.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/34770338850.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d976f93bc15247226a1d7d5ed3508913/32808198148.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/bobimatugiwutomusop.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cb32eaf096c0c7f832f1f65c57854cd7/waxutavamimo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e96a37c197e56f8ab25c2766a6590195/86297380558.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/vapofiludedijor.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36785affc---zixuligovo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112d7ad2b0bf---14403592366.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/nuxajowafigujana.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608791b034a14---78612978962.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/gubimupufubijoxokugowa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9974c5427---14629670008.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e8a8f408---98675832614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=will+wii+u+play+gamecube+gamesPDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 17232 bytes
SHA-256: d3022ec5d75be092c5bf6d669abd89977672f2ed366be07543bc7898dbb37648
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10728 bytes
SHA-256: 1819e490c935b18696e63ed6b5cc6f7d88971e4d4809f674b210fc42628b178d
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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