Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a18aa7cc1cba57a…

MALICIOUS

PDF

117.8 KB Created: 2021-08-11 21:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db37922c143360efb61383dc0c512da0 SHA-1: 9c23d4d0355891e73281b0b5231c5a91be7d8c44 SHA-256: 9a18aa7cc1cba57af3eb2d61867ac84120ad0d8cfe20cf82220b668f990bdf57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest a potential for further malicious activity, possibly involving JavaScript execution if the PDF were opened in a vulnerable viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://immo-cjeanpaul.lu/userfiles/files/89520440553.pdf In PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/bezododupusesazal.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/40857400619.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52936269578.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210807004203_bx4xjm.pdfIn PDF document text
    • https://cape-electronics.com/media/file/bakiguzas.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100d4b771466---vojebakotatadexawerika.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/mb6teisl1ubcq2mvo9u9imq6t3/68274394134.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160861086b231f---kujepobogudakuvu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xevarabotexidupa.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/monivowusevexiropopo.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/kirawaboj.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4921ba5e3fd598e6fea9e1fc2f32d2ec/fixebubivisegewa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0c4eccfe451d7760e754495c54daffc1/528777418.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/boluxeguloferixapa.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/71121114706.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/50988212391.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/56199848999.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f09ead75c01295b25e0b46e3d63acb8d/51581809007.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/53973378383.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b080c39d894---kanubularesona.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/21894578779.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbcc33f651---biluzeko.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/3900560474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=royalty+free+bamboo+flute+musicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4F 19348 bytes
SHA-256: 1db95c3c4ece72b101df518ef5172f368080a7ad444c8f6f3e9825350e9e0d37
font_01_sfnt_off000180f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F1 16244 bytes
SHA-256: 011fadaadb30219887150f152b5867f28ee67e937c340c716c7fc373de039042
font_02_sfnt_off000196f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF07 10792 bytes
SHA-256: 652454d0ed1b43afa944017a0ca0b08369c7ed191301abaac0bfd28278de6c33

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