Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebd37ea25b981ab…

MALICIOUS

PDF

74.6 KB Created: 2021-08-01 12:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b629699e68fb74bc383c13d76590691 SHA-1: 1a8a41569200eb1b237d5a6b2d597d168a9bfc1e SHA-256: 8ebd37ea25b981ab32940b3c8cc8c188fd761638130528e6e6be541d91a66990
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of a 'download button' lure and a callback lure suggests a phishing or scamming attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b379fbd445c---webezogu.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/buzigepegolawijo.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/fulivuzanazajafapeviwepib.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc9765da38---pukakigananor.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa22e6172---9769071875.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c324d1603---83977032958.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ranuropapirunebot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcdab93b8f---36620116909.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k68t21s8jnqnq5vevgfo45ncm4/taximigeni.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8qup5cd2804q8ptje80ntdeone/lonaxabepaserelobazikilig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71a629a40---jadariwijufu.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/38031531936.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/58636150751.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c968993f99b70d5588bb81cfb46a11c6/36485689321.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b97cf4c57cd---pibaxibutejebaluw.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/6073816229.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/mefogonifugukufalefep.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/84921119453.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a07c50b1---60911638251.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jejaxedu.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/fafirexuminavotolavunutit.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c40c585514a8fa6b38401adb290f0bd4/petopalerexupubixesimovuj.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/farotubomaxogitovof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kabir+singh+instrumental+ringtone+download+mr+jattPDF 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_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 11144 bytes
SHA-256: 695febe67e4ca3ebc94a305232001fd2ba9b28c7497e06dbd0a59b1bd9712dbc
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16296 bytes
SHA-256: aae1b693d46cfcf51457c4a500754b9c08e7e3363ecdd7b81df119c589fb9dab

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