Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ea30a3596a7ba0…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 23:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdeee65c90a6fed50711a011890a2b83 SHA-1: c7a8ef68759bb1ab91e26ff37169a001ce1a1cf8 SHA-256: 90ea30a3596a7ba0f097a4c87e58747b25fbe1dca244440565af3ab66a3ab138
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, likely to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple links on potentially compromised or disposable domains increases the risk of user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b2ae3642---mujuremukajudoxuworitot.pdf In PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50370215180.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161052a6302aa4---xitewikoxeditimorapuzo.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/tuwekiweviru.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/bitimomabeli.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54c09cbe5---rarabitigu.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wemivif.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/55424300202.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/rafilijaj.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/lawifodojetagamutaduji.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/faxekujinaw.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/42386384156.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a931b6e8c---10692053397.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f00742388---porunes.pdfIn PDF document text
    • http://teakdeck.pl/files/file/nikomezamuxomoluzupe.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/12498638028.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/dozuwi.pdfIn PDF document text
    • http://markone-tools.com/upload/files/14529635108.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079712122228---fijet.pdfIn PDF document text
    • http://fedoro.ru/upload/file/tusige.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/14137271626.pdfIn PDF document text
    • http://didula.com/img/file/paziwoxotodigabiri.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d29a3c035---tojorudinokukamafuxor.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/motunufoxumoredufe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ddc85bf7df70d45f2cbe1713f5318fb3/jexawoxu.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/wakolomuxutixozujufazule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=teaching+phonics+in+context+pdfPDF 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_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 18456 bytes
SHA-256: 1bed79075ec08d5ca18b17e9ccad58711ab86d766deeb86b9395ce0518a1da5e
font_01_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 10816 bytes
SHA-256: ae90b5a10a889e48975cfe5e522160ad81f1a55dba774f90f9cc613ac418f6fe

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