Malicious PDF — malware analysis report

Static analysis result for SHA-256 74eaa4a299556f5e…

MALICIOUS

PDF

95.8 KB Created: 2021-09-17 06:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a3e31c46fbf9675deae6bf109f6c70c SHA-1: 5fd366a21137d1773a1b27e3056cc9a2e015ba9f SHA-256: 74eaa4a299556f5e5a627dd1917a1a4b1ae77deefa98b4015690e0845b54dcf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=ready+player+one+free+pdf
    • http://rs-entp.com/upload/file/87904662658.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141f86b7a3d1---46779385262.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/balarurufosub.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/povelonudifadaxurebowanos.pdf
    • http://obasekiestates.com/UserFiles/file/gasemotaxi.pdf
    • http://msiutilities.biz/documents/fuvose.pdf
    • http://nextlab-semi.com/files/fckeditor/file/3607096153.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b940a140b7---73540897213.pdf
    • http://abwingsva.com/uploads/files/gisap.pdf
    • https://vibangnhadat.com/uploads/files/4966556725.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/32119064978.pdf
    • http://mq-water.net/upload/fasaxibefepetipopafejal.pdf
    • https://swift-tw.com/lcc/upload/files/rapubesid.pdf
    • http://wych123.com/upload/files/wuxunufitatiku.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/9011066727.pdf
    • https://sassanoproperties.com/FCKeditor/file/fubotasonivagegexenotef.pdf
    • http://printific.com/images/contentimages/files/wugek.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161321b8fb4644---womix.pdf
    • http://cycling-software.com/files/file/mizazujazu.pdf
    • http://szilasfood.hu/pic_upload/files/89021535310.pdf
    • https://k85shj16h-561lt.com/contents/files/66396993622.pdf
    • https://meganimal.pt/site/upload/file/bavisugedatewaxibovipe.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_off000112f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 16792 bytes
font_01_sfnt_off00012b09.bin
3d4695199815999c3c78d70eefb5a93374b0bc4ddda1869d75a067efa75298fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 18104 bytes
font_02_sfnt_off00015a38.bin
05fe6ea54ce7ba87d1cd126919fd4bb9194ad5be81a35645cd264d0c93e0fbc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A38 10292 bytes

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