Malicious PDF — malware analysis report

Static analysis result for SHA-256 165150b97832521b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c40ba0527ce6a78e354afd0d8beee36d SHA-1: 2c8ac7f5068c89e135d9469fc4e563925ab0dea4 SHA-256: 165150b97832521b89d02990343b99c9cac59a17d91bfc35127a5df88a45597a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest the file's primary purpose is to lead users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gioiacompany.net/images/upload/file/pewari.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f038106447---supusepi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/q2uto19dn2ud5ncq5sro1hl4l6/pugogu.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/42126616699.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/38306728697.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/42948574363.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xowogepubuza.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/vovadolawojuxapap.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/jipirefabuzatirubirenoj.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/1715600029.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/72634056924.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/tepabinizo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161368d6a22ef4---zupepiw.pdfIn PDF document text
    • https://limadelimon.com/images/file/dirijufitup.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/xevivirewiwogamalodo.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/18848426696141cb9779230.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/11319033649.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba5480dbf---25183333868.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/bulalenevukanilagoko.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/suvepunutuwipexod.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/befinejojozil.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/babikava.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/56458201384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+transfer+data+wirelessly+from+android+to+pcPDF 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_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 18712 bytes
SHA-256: 21003a431facb4750651e65e7d4bcd52a6906502a7c2b83689720e29c25d7004
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 10972 bytes
SHA-256: f1f2674ff613186b4fa15c3f17ab00d868f4df6bf3707c3283b022e09b3c10a5