Malicious PDF — malware analysis report

Static analysis result for SHA-256 954d10ddb2853b42…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 23:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e03002a7ed7276541acc8a6b65ea4167 SHA-1: 9673165b43dbbdca41c15984b1b637355a147cf4 SHA-256: 954d10ddb2853b42616f344e1dd39f2f74c74f1c0fa67b2378aadab15e3fc712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary attack pattern is likely spearphishing attachment, leading users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=traduzione+manuale+pdf+da+inglese+a+italiano PDF link annotation
    • http://joyear.com/ckfinder/userfiles/files/marowexi.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/51044389973.pdfIn PDF document text
    • http://fittbike.hu/files/file/31358812478.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/14065880048.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/61333779764.pdfIn PDF document text
    • http://mobitransjogja.com/files/12882596653.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210628_1EB6B0F4FA96C87A.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/80522144990.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/65435678127.pdfIn PDF document text
    • http://adveotec.com/img/file/48528572748.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/56315918513.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/betupoxexaporaduri.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/36920381035.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d068b1900---19391701763.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/roxujidezonebit.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e584f87196---79909352961.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/nanawuxedusibavojak.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/73237185627.pdfIn PDF document text
    • http://rurisnet.org/images/file/71739246028.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/65346832401.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/90278325954.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g8kena017hcgkflmmu43bttjav/lulaniwimibil.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/98491972927.pdfIn PDF document text
    • 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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10964 bytes
SHA-256: def079691707770fc23c8209aaec44dddbb9a713877a661346bdb4f29b20a526
font_01_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 17752 bytes
SHA-256: 83de32918312894eac67666457b70cadff2de8fdec7d964bd8d5816a2df6b849
font_02_sfnt_off00013c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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