Malicious PDF — malware analysis report

Static analysis result for SHA-256 98363ab5aff0dd4f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 12:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9829e4d84021bce3b0074ab428881aa3 SHA-1: 0a53ae13f60ea8aeb7ca48eb0716d476e144466e SHA-256: 98363ab5aff0dd4f234937d6d854a14f7f49ba85a66f0957d7eeb64bd46232e4
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=13+poker+mod+apk PDF link annotation
    • https://cuatudongsaigon.net/uploads/files/jagutepebuteganojesipu.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/20142900284.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/zekonesow.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/15975428048.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/53073125517.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/62472717573.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/59160831447.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/bepirazotekogajib.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/kilerurapoliw.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/84731438229.pdfIn PDF document text
    • http://prompol.com/media/file/1690253288.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/tobozulegawupinegonoma.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/maxodokixi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/14298585572.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161308eab2f537---82762139862.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a845fa8f03---64302977766.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143180ebbc82---ruxamexilazikesi.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/58640200343.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/50985198381.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/banunisul.pdfIn PDF document text
    • http://land89.com/ckupload/files/wevirodesa.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/fujajizeworidudibapuban.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jegukovadobotajixozo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6196f19ed---vodebuja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 10264 bytes
SHA-256: acf5db71e6c03fb2e32c81184cfacbbdf5b833f413d8c353cb12473a6f6e81cc
font_02_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 17440 bytes
SHA-256: 9023442acb1bbe76005660f7d3bb66c7ae3482d575b76ff48afa4846d4a82abd
font_03_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 18236 bytes
SHA-256: dc7d7ad089864534781dfe04ec30679ddfb5b7954d4026c89c5945d972a443c7

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