Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8a835aa26dc78f…

MALICIOUS

PDF

83.5 KB Created: 2021-08-09 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e886500b89b2caa2023bd30cb42851a5 SHA-1: f60d7a797bc604e8fa7c28ead1504c98f7ed707d SHA-256: ef8a835aa26dc78f3411422aecc791469b9d94f24ec74dd307e931f45acc872f
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/mexeligadomelewafajig.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/80488047172.pdfIn PDF document text
    • http://rm-parketi.si/uploads/mijinuniluzogugegudu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/zekuwosoritifadifuseja.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/tigum.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/94886aafafbe4adb0f918c1048a3e367/69276095206.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/25259954855.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t03npnfnginq7gmucp20coij64/49261380130.pdfIn PDF document text
    • https://negaratoto.com/contents//files/wikaxab.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082117e9b4b5---42776599397.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/73029306075.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc15d5d56a---26219213104.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/495500060be8a168e6961771e7ec9157/29551656404.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/36811527166.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/22108464441.pdfIn PDF document text
    • https://efnnma.org/files/file/59608151829.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae594be02ea---dozilekapadatu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/87832056051.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/97623222474.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/64891177742.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/191549357635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+much+does+daycare+director+makePDF 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16876 bytes
SHA-256: 7768bb89d680148bdd6299bdab4e3933f430ffcef6207964fd0243cb47ed9881
font_02_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 10868 bytes
SHA-256: fa57b705313d83a2dec2688c06af0be1dd9e581b87bea6e1f750d85d30401bce

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