Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff927e190c1099…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 07:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6622513c3743c0b54c26f1a9204c8758 SHA-1: 00e24816f02358b9a4c6e2ea1e7744c2b1f49682 SHA-256: 91ff927e190c10990732ff2063cd92c705271497dbbb4673fb5608f1d4c87474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for further exploitation or credential harvesting.

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://allytemp.ru/uplcv?utm_term=bnf+2018+pdf+free+download PDF link annotation
    • http://liavanhaeringen.nl/userfiles/files/bavizezozunopalitoruvu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412468bcfd---mimusil.pdfIn PDF document text
    • http://beldapin.com/calisma2/files/uploads/bawirow.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/96969110049.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa66e6b22---lopigikaro.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ff74d3c7---71050961409.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e085dd1b8ba75670784872d198c2320c/96875089778.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/fetanutatupa.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/193ba4bffff4c707facdde0efc6ac8ec/mopibifusekesamira.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/80607414860.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf82c7fc36---38222252094.pdfIn PDF document text
    • http://fkhd.cz/data/img/31322944824.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/6259753778.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b577a063c34---62771181715.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/21054712275.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/93838484880.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/73394782021.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/21667067188.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ca711ec19---ledimezu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720506ca858---67841386461.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a459290c---59967338037.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/8081032450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10772 bytes
SHA-256: bbcc9e1c145f4ff5601523be741bf090d86d346941d729193fd013a6335ac8c3
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 21104 bytes
SHA-256: 30dd2f3d47dedc307e119e6e4f9a1c8e4928cef0b00ab27030b9812270aa843a
font_02_sfnt_off00014b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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