Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffed316b3ea304f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-01 08:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7c0915ed6ba0cac7114c1126532fe48f SHA-1: 8c0035ac6585ecc294976d128f4bdf74efe6cfab SHA-256: 1ffed316b3ea304fd9b8f9753ea0bdd6c5f65e4c370e87f8175866be523d4f2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896a6815bb---80480352283.pdf In PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lifivapopif.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/48432002315.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/62817160512.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/zaniwodafiragomukutul.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae900bc54d---51151316286.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/40919865571.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sikezowuzafakivizatejef.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/jubul.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/0385914bc62c3163b2f24ad073ddc596/26673180299.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zuwum.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6047a0f69b---60368263244.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/4676212909.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/57950135965.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7890b137---wabiwemikomutodugunubupe.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/bubotenexizetagalujel.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/doxexibofizizefo.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lofejusowewofudiworez.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/rufatupalaboze.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/97336757315.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/wujiw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391fe466ae---lazawapobarudim.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/27301053215.pdfIn PDF document text
    • http://evola.it/userfiles/files/19565534531.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/tenarumofelatafab.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd583187b---betutedol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+spit+on+your+grave+%282010+full+movie+download+in+hindi+480p%29PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 16376 bytes
SHA-256: 944ae0ed1245b8ba52f13d7d5af811cbc33bc4ff1218d409ec7990441c4d72f9
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 11996 bytes
SHA-256: b6084b8d96a5af238f3996a00893b994d1cbb8a2594f5cb5453daee57eef9086
font_02_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 20096 bytes
SHA-256: eddf1b6d8f26dc9b442409da0651bb650255750739734f3dd97b34b690e9a159
font_03_sfnt_off00014491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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