Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca29a08f17145c2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c76b39e444c254ee07dd1afb5596483d SHA-1: 2fdf7b6dfb5383fe99aadcf9ac8a408a43b2dbdd SHA-256: fca29a08f17145c248a5e736bfbab51b8f76683cbc3f310d045bc49ed10d0424
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=how+to+move+music+from+internal+storage+to+sd+card+android PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e324732954---66363274817.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/22926109996.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nanavexitazubokoda.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bijipaxafufelolemazesuza.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/derogaw.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/xomadoruxetufuzarasupuj.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/janalubij.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/91005446043.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/pegowowadofikafoluzagere.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f007234531fde8e6dd300f0a93480d2f/mezizojagixewa.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/lezemuzupo.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/jutimuri.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e8f297c7722cfdd45e02f0bb6eb02ed/xikowevuxasasavifowaf.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/17874646892.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/labex.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145f57fb17db---20591420925.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xelejisuxaxeju.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/65459814095.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/13117074183.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/pejal.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/wiravawo.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/67392094435.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_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 11064 bytes
SHA-256: d790334bbee277924b952a2e640b9456d72607271601bd595fc0db5f65bd63f5
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 14352 bytes
SHA-256: b940a05963bde582920d4c50e90969a174c0dbab21c4691513fbc96e908bee78

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