Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a56b5619d83ce0…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 21:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22fdd610d5a8447451c9debd65ea5fc0 SHA-1: 422de6347bd03c4b701e319074d472ea56599873 SHA-256: 64a56b5619d83ce0765c76c721aad2b5344b765023e7e87beede025214d1e1bf
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to multiple compromised WordPress sites. The presence of numerous links to disposable hosting and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8489744b1---57820738423.pdf In PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/kimamilevuguwop.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/fazul.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/39476645797.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/26844260936.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/libopijijonawiborijedop.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16112082dcf793---belizusikezazames.pdfIn PDF document text
    • https://chptravel.ir/data/file/88285795527.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/27726626358.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7545b51c---27107245126.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/42303930141.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3d3df802---pevatevomidubigudo.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/11099130214.pdfIn PDF document text
    • http://sooclose.eu/upload/File/pilijojelav.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/42414093057.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a60739f4---57652417684.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e3db7d67---10009648169.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/pukukipijuve.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/dutaralakulisusa.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b80c961ac---36470655499.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/5351451934.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8ef1a7b8---jovurubij.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefutizili.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df0f83d9147---42702685029.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///xabovogolude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=atomos+ninja+inferno+manualPDF 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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 10588 bytes
SHA-256: db38f5ab7b46b662e99a0dd9358d23597990be0cf11fbcf27a9bc45fc887820a
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 17452 bytes
SHA-256: fb26be0919ecdd21183e4251145cbcbd3ac835af3b5914450798f9433fc91df3
font_02_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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