Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7c8d5e4ced3119…

MALICIOUS

PDF

91.0 KB Created: 2021-06-30 17:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33a6ff48ca3bfbd6781531b3f1097738 SHA-1: 5bef4c85cae18f69937c9a67739d4557b92f9186 SHA-256: ee7c8d5e4ced3119548259f5e693ef24f0400d535c2463bfa3aa44b10125326a
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to host malicious content. The 'SE_CLICKFIX' heuristic specifically points to social engineering tactics that instruct the user to run commands, likely to download and execute a secondary payload. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest a malicious intent to exploit user interaction for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://joebalogh.ro/imagini_ws/81954016782.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49e4c14eb---66618217562.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a0f5a07d594e0acc53ef9b15f2fcdd5c/juxulenomodafenidipokeju.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c5d65ab8---66031718346.pdf
    • http://mega.kz/media/upload/files/34404994639.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4c28312f669148a4f559fc7a6b446775/jodumejariralevakazof.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085770d4101a---22850942969.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56e098d4a66f14cffbd27dd911d52cb7/tulovegamine.pdf
    • http://libertyquad72.fr/userfiles/file/wefavev.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871d81e1610---fidigugusapobu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b86f37b06f41ab8da3db81ab6ba7293b/fafalup.pdf
    • https://alperbehang.nl/userfiles/file/vexaxatikege.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7fc61db1ab24c77539b41cd968b84978/51310960116.pdf
    • http://school19-zav.ru/userfiles/file/zakilagavufobadobe.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/27439383547.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079869f67395---40146621982.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f90d4e04b8---17303742033.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sa26krhmbl5ehdrr81gi6461h7/54862103967.pdf
    • https://kodcomputers.ro/2664/uploads/65243924544.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/71202648862.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/702e50dc0099a3935f079d1a261371e6/xunazosomukepoje.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h81lo45fudpvsbovleduh8vce1/bavogoruxip.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbba062dd0---viriko.pdf
    • http://prinsart.ro/uploads/files/girodizajowor.pdf
    • http://diclenakliyat.com/userfiles/file/vugodawuxudimuvemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+password+hint
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e508.bin
820556054289ef51bfe6f3ff5d49fec67670e03b8732690328d2eddf2a8feaf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 18472 bytes
font_01_sfnt_off000115de.bin
4f0206b7f1b6e0c9b6a6eefdd2a64e8d84c78810f7aec543f84a655a3f6af8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 10808 bytes
font_02_sfnt_off00012e94.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 16252 bytes
font_03_sfnt_off00014474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 16792 bytes

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