Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff41d6ec19380c97…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 10:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a405f06c0c24ed94588785ec5aff2aa5 SHA-1: 5fe9737b1f3294a18dcf2e3e6dadb68c1d18f689 SHA-256: ff41d6ec19380c97c987c18a37ed7eb6e6f63031af8234a571ff9023c2c1d41b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://3colorjazz.com/fckeditor/userfiles/image/48027540832.pdf In PDF document text
    • http://beiwendq.com//data/attachment/file/156012547.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xorawofemugimo.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/48505600529.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609560d7d8cac---72455575736.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec554865e---87613819116.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/31793304560.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/midurire.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/96385925643.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r6bs1g9fc0bdvmvt84u74ugi9c/46132955621.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/81033715785.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/wugapepofizodafir.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/fagifesi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nenikejerita.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/pozolowatafutewexew.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/39855389866.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2nm3r8hp10md8rmsiga3lbe1tf/32292012378.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210511053135745646368.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b494f316---44713861123.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/97213994420.pdfIn PDF document text
    • http://kag.fr/userfiles/file/37439201570.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609182e141581---kijunimutid.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fijimaveregujolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=double+digit+math+worksheets+4th+gradePDF 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_off0000b7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 11088 bytes
SHA-256: c70652e45b6ce84c2457b919e283a95030bfb8ee52257bcba1aa30eda00bc44f
font_02_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 15468 bytes
SHA-256: cc106806a42f229a021502bac51cfbef708e426b8fc794086d647f0352f5f8a0

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