Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ac12c0779866fc…

MALICIOUS

PDF

101.3 KB Created: 2021-08-13 13:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 215f9109c142badf643d09ad8b2ad1c6 SHA-1: f4d24c1e2fd7ae62e99ebe5bb01063964e806834 SHA-256: 91ac12c0779866fc68b900970fe62281cbc4fe7292e4249e94727612cb69d98d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious files. The presence of these links and the overall structure indicate an attempt to trick users into downloading further malware, likely via a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf35b0ba3c---25168455150.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad7027f67---zagapavaxi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9isthvosubn8esae55ichmqjfa/60948767325.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f170b9cefae6993775ce763a14f57e4e/17474972479.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43071761679.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q4gajbtic3gi2351vhl160724j/43842064624.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/63923298767.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/6875462965.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/ridejadikolapidebosejax.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/8567263728.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c5501a5602a1de9498da4c9f273a5e0c/5799119652.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca6945521f---4446106795.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff1d3345e---gusepali.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/pipimegumexifazufafipu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/vajemirivovi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7900daed3d---maxegutufu.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/81704485489.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/josezowitatoj.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ead793dc5e42ecb08b1e851a72ad7afa/44138471776.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4a923ccf3d7b4804d8e398573cdf5fdc/repudetujumakun.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4743eb7b3---35217709574.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/38611296159.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fuzadabotegurugusajojakep.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/terobigetipukekivivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=water+supply+and+sanitary+engineering+lecture+notes+pdfPDF 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_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BC 19204 bytes
SHA-256: f5d55dab57d2884aa1e2507c919b5d6a368e6c5b85852c1d3f1f43991824a775
font_02_sfnt_off00016d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D23 11000 bytes
SHA-256: 4fed0e7f8a84538ed9501dee7b0a4962a4278677e0a40bd885c5ec15576fd6f5