Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8ab1953d76e02c…

MALICIOUS

PDF

85.2 KB Created: 2021-10-12 18:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed478a478d85ca6081bbd7f2ee3526ab SHA-1: d32070d8b84ea6b8b0a5800194cd19a02b4066b1 SHA-256: fe8ab1953d76e02cac97df51e55f8410d1fb6b1d5712503c44a29125933f40a8
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=upside+down+question+mark+and+exclamation+point PDF link annotation
    • https://fsbulletsandbrass.com/userfiles/files/wufabo.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/zadabumutejuku.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/4630101876.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/27201122538.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c1a3a554d---wazorajevedife.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/magavu.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/91227008513.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/jijukafaz.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/68978370198.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/54192329552.pdfIn PDF document text
    • http://xn--12cnpa1crj9cff4b4eybemi0af5u5i.com/ckfinder/images/files/47320519807.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/nimil.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jazemenuv.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/5046417486.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lobevarunelufisewufiputo.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/gemanamoraz.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/63710873301.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/monisojirakamatukuben.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/vukabuxaso.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a259bfe---zolip.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/m2oblr8fval06vgts4uld0tnep/31530884776.pdfIn PDF document text
    • http://beta-rc.com/upload/files/gekejurexumo.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/15949456622.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/bepexebit.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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 11208 bytes
SHA-256: 598dc7405c13b09237147a3597a5d03c73d077d2ef1cf94386d9c8e6dcd37a6d
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 22716 bytes
SHA-256: 5fef6c5302e1894d5ddff38ba786c07aa79703e99ce6ed33bc984b0e40ea4d64
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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