Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f49a7f284b5a841…

MALICIOUS

PDF

99.8 KB Created: 2021-09-05 21:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 221f0a6a3128d2eab735e29b4bf273f2 SHA-1: 440e207745c170c411f8c15febca0001285722e6 SHA-256: 8f49a7f284b5a84154e599b755ce54f018f4ce9921c4d2a77656e9376ab7a736
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The embedded links are designed to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160865d8c59e37---lufojawopujaxebupuk.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/67eae0b2dcd9744ebc04086918acdce6/66999542812.pdf
    • http://rc-mst.com/mst/_upload/files/gimuzebuxeliruba.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210728_50E8CF2208FB0288.pdf
    • http://habitat3.eu/userfiles/files/88396712397.pdf
    • http://bettaletroom.com/file_media/file_image/file/43156640009.pdf
    • http://unitekinfostructures.com/userfiles/file/31039593751.pdf
    • https://congchung7.com/upload/file/61798065520.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dddee2ee---63779549005.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/scoaonn3hutrvcjoum6jtpcq44/rotavuluf.pdf
    • http://kimandyoo.com/userfiles/file/90126252176.pdf
    • http://sanruou.com/app/webroot/uploads/files/volikadunepuxobime.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/50816acbfccbf535bbf8862e4118eea3/69632048310.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec2a9b0377d8561519375e51bb83ddd1/kotovozosokuveg.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/9255681186.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75ae94e03---nujixuvoxebali.pdf
    • http://preserveproperties.com/userfiles/files/zozebu.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/2044093900.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09d7ea9ee---54266549574.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077d56846f75---46359448830.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f768cb2f1dc---77436056113.pdf
    • http://innospectrum.eu/hirlevel/file/valusowenujeregixole.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608031d51e22b---vunudafutagu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda418e231b---72209714493.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee30f1833---21217432359.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160739e5809257---zuduje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scholastic+success+with+spelling+grade+4+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011610.bin
87947b7c7b48a8d3ccd0d52a99b7876f9471dfc18daa17efc8ec95485891f91f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 11236 bytes
font_01_sfnt_off00013046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 16792 bytes
font_02_sfnt_off00014858.bin
c4dda075c6a08546bd9a9cf763a10ea69c90250f847f35f53aedae9bf94c362f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14858 21596 bytes