Malicious PDF — malware analysis report

Static analysis result for SHA-256 08959b0ac259a69a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 17:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 987168a1a311d13a37b6d8aab05f197e SHA-1: 3c5e7cf5d1e72fef744af9a95f9388a655141d69 SHA-256: 08959b0ac259a69a658e631edd4859afd7301a964d70b5beeea34dc621c7d7da
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63ec2d875---56085516224.pdf In PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/78877024288.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3b6f17d6---88046351916.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/43080106043.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7cgq94kto5kc9unukah34hug5r/12812479729.pdfIn PDF document text
    • http://goldia.cz/data/file/93171201977.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711cdfae273---dobibuvomosefabakuga.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/4023142555.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/suzij.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1cde5012e---bedajozobebiroregoresi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ulhbd54if7bc4ecjg2uhq0jtld/67547483751.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bejonak.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8f112d36f192175cc52b971a0293a98c/fojopemavulufezudixib.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/sogerido.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/18857951816.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/poxefezipeba.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/9471795522.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/dagotidusazewusapezas.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/texakuximabem.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/376f97c8b19e5a60704a8d4802bb7615/zusedawazumufuza.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/73720659500.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c371c0ef173---jatozizudevimolikovitevuk.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/41129082481.pdfIn PDF document text
    • http://remobudostol.pl/pliki/wumem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=james+martinez+house+of+cardsPDF 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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 19448 bytes
SHA-256: 7222efa88c3d2d7bda6c2b1387d7d6804707aae5253367d4d8eb8daf1d08df9f
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 10848 bytes
SHA-256: 7365657d7cd3032ba4655f211f7af7f6dd960cefcbe68d3936a20266412b0468

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