Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc54b90fa6714b1e…

MALICIOUS

PDF

113.5 KB Created: 2021-06-30 23:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 952134ef8d088436b6229326e36dfed1 SHA-1: 2d5dff671f4fa0ec263873ceed8b75b189e20ac7 SHA-256: cc54b90fa6714b1e08538f4f0049ca2f45e665b63c06be10fa3fb3e1769d73a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in callback phishing and tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://invest.pl/userfiles/file/bobobenizitaw.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/411c22deb52dc59ecfabd952f25ed825/puvuv.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/238d11c26ad8347f4f77fc50dff73c61/pubepajiduk.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f34577e268ddbf1ac0486270dc5b0334/60436956221.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d7fec8e8---62731183426.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/762302db8ac2124ec2c093451314de39/sozofivoxe.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/85037892780.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16094104de6c90---tegolufevu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hlvic097v7lnjr1sp8gd4b0p6v/neporasafu.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/32301433906.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9s3qb66p3vm1m7hcthjq1fb1k8/kaxijujamifuxujudofamu.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/9765792292.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fapukapusarizosurorotal.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/93920340319.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/be3e8c7b291a8c330c4a018796ab8458/pejuwibibut.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a9a22d42f---58138874194.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/7985263392.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072515fe1a68---18671048644.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hqpba1bt5e19psh1iiepll440r/18981048566.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/35898971524.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075440772303---8138195979.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/79247744749.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224076803213.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/puvewinorudaxegat.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/db2e5d3c505e4d9311abd7b784e3f952/gizozaminujegexuzomotiwul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=everybody+hates+chris+season+2+downloadPDF 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_off00015853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15853 10976 bytes
SHA-256: 9f70c877a307be72cb1dd3f4479883e1cb0b063125eba9b50b7bcd61035cdfa4
font_01_sfnt_off000171d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D7 17804 bytes
SHA-256: 7bebfe370315997d265635f95ad757c5f37d70fe4db49b1453ce465feb950ddd
font_02_sfnt_off0001a047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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