Malicious PDF — malware analysis report

Static analysis result for SHA-256 74164263590d5b3b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 14:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5fd171dd68a3b1ba9243e81e881f794 SHA-1: a83a248a910a7f25acf483e392ce1fea38385917 SHA-256: 74164263590d5b3b2019fc6a4b9499bdb7dc46d85ba0c4fb18fc3670ef908975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous PDFs on compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple links on potentially compromised sites indicates a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8bfe44a40---kazaxalawuj.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b097496e3d6---42906683445.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/dokogolu.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/13898928047.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b1ac6e617---koposaparir.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/66254889063.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d1nvpivr26gtkqg8lpq574ecb0/pelajawixipazigopinebawo.pdfIn PDF document text
    • http://locke-3c.tw/uploads//files/202108051159163616.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75dfb88c5---56427889460.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g335tak3ac0ijuhok57sr0ab0n/soxejazakurazil.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/98578673933.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zijivawexoxatezavir.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/78221212214.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607820a595523---64212345175.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/tetexajozifukaxen.pdfIn PDF document text
    • http://amandamaitland.com/images/file/pawenogele.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/53131457455.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/sarinunuwun.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/sufegubeduwazoje.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ouen7cmsiuasep7laorh18gg09/pebigefow.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/57849993702.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/pulodedomivu.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021072214450273499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=howdens+kitchen+installation+manual+section+7PDF 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_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 10852 bytes
SHA-256: d0408e7d0ec0f68aa36ef74ed3f0b02ff76b2fb4d494da1779429ebec5135267
font_01_sfnt_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 17068 bytes
SHA-256: cb4d80b97f5a66a628a30c6b76b36508f03adbbf700700c02b90fa43a3932b95
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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