Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4328a2e9c9c8f1c…

MALICIOUS

PDF

89.7 KB Created: 2021-09-22 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 087ce8983f2f5d0369fdc0994b1188f6 SHA-1: 36982a12caa525e34f11ac161101b780a96ea146 SHA-256: c4328a2e9c9c8f1c07f8910d490681362e71d25dca00493ab8946b0779a1a184
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, including those using IP literals and known CMS upload vulnerabilities. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure imply an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c4e1a5a5---pelop.pdf In PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/mimagodosebaxumivibagav.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///89526368489.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ec051a6ffe082bac007a8e6e0a06ad2d/56947168277.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/de53054b9bf0f84853fac59a87a68ad0/fuwoni.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/22619771661.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/4344262829.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fc6f476---52555299524.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dilaner.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/napitaxe.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/50185491289.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/lewamosilizodi.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/nuxezavovativiger.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/96827476948.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o37vou7ds2n740lnavovtnrt60/jotinosaxuvorenaperogujum.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/temuvonev.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/vijupu.pdfPDF link annotation
    • https://aayams.com/userfiles/file/82621431384.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tavof.pdfIn PDF document text
    • https://ismart99.net/upload/files/vopadezalafufanomomesi.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/ximinexobebup.pdfIn PDF document text
    • http://nanopena.cz/upload/file/92991802810.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/27076596550.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bajuboladoxamakinimimori.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/95248864424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+graveyard+book+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_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 18772 bytes
SHA-256: 51dbb58eded2066c9efd841faabfa4c8d8d4fe5a856e13473d29610e108b427f
font_01_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F8 10644 bytes
SHA-256: 30fa03270fb7f7d9a02f7b8ccb328655fe0bc5aed6b90844c8516ead709698af

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