Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8210cd18639bd7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 03:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db9ba10d69b1ee1c0ae5fb07535458d1 SHA-1: b60171cee37951c0b88e22d26014346bcf47e41d SHA-256: 8a8210cd18639bd72faa8e0f40a9dac8ee23d7f5d49c39e7c871fc27bff80edd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document attempts to trick the user into installing or connecting with a remote-support tool. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised CMS upload directories, points to a phishing or social engineering attack. The document likely serves as a lure to download a secondary payload or establish unauthorized remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46da87638---julixot.pdf In PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/5624647523.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/kikakomosibevodapis.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc27f6c4c5---68277058406.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa07e806b---ralojelukutonekinez.pdfIn PDF document text
    • http://ailizia.com/userfiles/78454475025.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/derakanexuli.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/kapolutipunusoxezetegafoj.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/57280604562.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/nobidisanotonivezej.pdfIn PDF document text
    • http://st03.it/userfiles/files/pevivelar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d994e505b3---gudumab.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a365a7a8e---22053127309.pdfIn PDF document text
    • http://15881588.com/ckupload/files/86335638720.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kijojusubukiburewak.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/7660300556.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb581addf56b41fe43e8d2a272a6bf16/wurumar.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/18533160959.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a220bde29ac---58146320809.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a347912aaa5---tabobevixemabejav.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072782ddf2d4---87617046261.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078df9bc1a67---20068558109.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/janikiwosop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+stop+pdf+from+opening+after+download+safariPDF 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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 17860 bytes
SHA-256: b6080c49a85c5686de88e34e460f6a7ab556f3d80fd3fea4a78a159da75e3589
font_01_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 10920 bytes
SHA-256: 93a56c7d3f19f257a3dacd660ed51e5d7a6d3bb142ea14d8620bee8c6d865a0d

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