Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e602c757239caa…

MALICIOUS

PDF

76.3 KB Created: 2021-10-07 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 822ee8be519961824b5791a50a07e872 SHA-1: 25b3e32301bdfc7e1f00700fbc4fdad7d1ee3bd3 SHA-256: 96e602c757239caae38ff471e1d3432e68eaf9edcda1dd810ee439030f0461c8
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=irfanview+scan+to+pdf PDF link annotation
    • http://2safe4u.cz/UserFiles/File/72744478550.pdfIn PDF document text
    • http://ecole.ru/text/images/file/bupedijamaladakedaxoluxe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/oad1f0t4r685gk35f2rlpva8ua/59595473394.pdfIn PDF document text
    • http://sql110.com/pic/52564244106.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/2141730310.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/67781350285.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/livetuv.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615863a44dd3b---tobijanifomenodojamimotil.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/miduzojafuxububa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376aba5180c---kowitu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/18504686478.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/25503907818.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/19687192588.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/27109845787.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/27565581308.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615d788d50132---tibakapisagupigixotaxute.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8e6172c60c7678c21c9632d261ead39b/xepapidumoke.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/63013293509.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xexisa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161313556b9c70---53713713797.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xinope.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/82659132888.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/77951568518.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61730767586.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_off0000bc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC33 10668 bytes
SHA-256: 995562a996a674894b9f972f858b37cfd0d052b67a4e4f531f71368416376af5
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 21020 bytes
SHA-256: 19624b139d13cbef27db501fdd6241b06e1c8ffaa166c23e4a32063d8ac2c344

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