Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf49cf8133bc7cc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 21:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb69183d2bc6a88cbec33315581d0481 SHA-1: ff27f681c393a5493ee6e70ef4963c0175b24f83 SHA-256: bbf49cf8133bc7cc897ee4b68986797b08c1c5f0188b2198faeec3fc7c7a1bbe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=hp+12c+android PDF link annotation
    • https://shiokuda2.com/contents/files/pupizimukesijitotewi.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/79821498063.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/53996325317.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bedewure.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/kugoditawuketon.pdfIn PDF document text
    • https://olajpark.hu/files/files/10101209581.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/vixakevefulef.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/pugosivezasedevajagetevel.pdfIn PDF document text
    • http://one9five.com/userfiles/files/68310328952.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ccf244c3---zavawerir.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/zakatevamonadupivizowofu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/17079725753.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/wadudininezobebes.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/30974466805.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/zagewikebaxume.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/lagajugulivomokidi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614373eee364b---sapoxusemufikunuf.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/19112792193.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6ce5cbad---gawexewuzonorajivej.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141545faf894---sorilajibapadamigodabod.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/591584a726c6c39f7a75f5c2b2f20a22/85328250738.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/64666375786.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tuzejaxekevirotamapibesa.pdfIn PDF document text
    • http://hidramaco.com/files/files/64305452993.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_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 18264 bytes
SHA-256: ecca38765dcb89451b07f060ac3c58794d9eaba50cf19b02e8ba1d4bb57abb6a
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10224 bytes
SHA-256: e6c1413606e26e09ee932fc32936b27d345b006bb5e4aff71a2dca62e494acfe
font_02_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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