Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e22bd796aff0a4…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 03:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03aaf40aa87237bd551e9277829740cf SHA-1: 73ae0b70b0e969c7c43f8134140c9f38acce6584 SHA-256: 53e22bd796aff0a45daed164873c3956c574f7f58886df4a41d4b1663e57f5f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were directly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fime3d5b5svs1a0853bs42iok3/25230500298.pdf In PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/14327557687.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901163520_306024895.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/49287188756.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/tejegoxewadojejetupivub.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb13dbfbf---mojerelunodamekawikidu.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/ziritolapisep.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109041128382768.pdfIn PDF document text
    • http://abnicum.ru/files/file/werirepakuwizali.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/80491255715.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/21882406639.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kuxafobimitaxuregix.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/78475116579.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/fojanumapis.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87974492265.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d7e1a28d994e6d7ee06329940291120d/wuziwerefamokasut.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346b8dd9b38---90260442025.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b4f1c707---61474629076.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/70305192574.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/41231369793.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/83096280196.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/97808669314.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/dokixuvuxida.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/morizedivitivubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+hedge+knight+comic+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_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 17880 bytes
SHA-256: 8accd99e5f55f5257860dd0c820d7465b6966fa32487e38f2495bd2e14c61b98
font_02_sfnt_off000145af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AF 10648 bytes
SHA-256: 2962b5cfdc8be3d414fb165818bef793b5c2d33a8f18a9f014455d77cf85675e

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