Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7309a8ef94f17cc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-23 12:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5b395afc18473b929a4140399c3becf SHA-1: 5ffc7a6c42f543f9d8bb170b7fc6114fe06624dd SHA-256: f7309a8ef94f17ccebfeaae2e477daf732a00dac74f4b970284f82c4c0f13ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://emtracing.net/userfiles/file/muwigabowukeso.pdf In PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90121431855.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/disekepizagobajit.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e379f353---5906837967.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/wokotit.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/fudasagimogetu.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/fuwunejiritezexuvobapaxer.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d00d593f1---72235859807.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51dee335a---wemixeronuvafakoduraxez.pdfIn PDF document text
    • https://aksusu.com/upload/files/rexudedivikubagu.pdfIn PDF document text
    • http://handgun.ee/media/file/21426560527.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56543486774.pdfIn PDF document text
    • http://dytac.hk/userfiles/60338675536.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/nepugosejadifepefilasivut.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tofexow.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/66933128303.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riniwuwatelakebotupuxagik.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/1928171550.pdfIn PDF document text
    • http://henca.com/files/details/file/xupofulefudorasibet.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fac05a51---54180719778.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148d68d2dc78---zodetutusoroj.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613352b48b5a4---70758432114.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/fazod.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/27064986223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=set+default+dialer+androidPDF 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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 10356 bytes
SHA-256: 81b43ae511ee83f8a85a73ec57a427053ab2f46702515e96a1f5e520e62bed61
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 19444 bytes
SHA-256: 96523e6bb6f993f89149fe50018a12bf0a245a1c1ffef863223e731a7227cf1e

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