Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3735c4989141cc0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 23:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c45b14e27d22a2f28c1e9d18c881d252 SHA-1: 2d6794c792fb5b3208c2987754fae531bcba49b7 SHA-256: e3735c4989141cc0c905cf1e26055bf876fbff9ccf846022d4e42e9e129c8d58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lejuriste.ru/files/file/51207416657.pdf In PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/joxawivepu.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/xisamixadevufuwuzenor.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/buregesiral.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/20021981559.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/p4qvudaovmmt3suglldtpn842l/tunegunu.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dogirujosiwida.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa78f2a23---sadedapelivekugurin.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/babeletopumavuvemofir.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/83931096201.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/lusesufo.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/52198540488.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13081372300.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/19833597485.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/90116589329.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/limotuxu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/vazerafup.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/52697144417.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/84121545362.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/46es11a7ekbogljtld0dtcu36e/zerak.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zubumoziri.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021931819277271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=yo+movies+free+hollywoodPDF 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_off0000b9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B8 10504 bytes
SHA-256: cc61372d7b011a946f886ea33ad69fcbceb0c05bbb85cc68c34eb3777f0ba419
font_01_sfnt_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 15924 bytes
SHA-256: 3677bc3868d15e784511d55e30ab83fada4dce38cfad46f9dd2246610e0a857e
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1