Malicious PDF — malware analysis report

Static analysis result for SHA-256 344a5a9a2fef59c7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 21:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3517b197e06b92b6667106ef8c67631a SHA-1: 92bf8ae20cdc0bc58ec755a82ded973dc6b0a335 SHA-256: 344a5a9a2fef59c755890003af20c49a14a14f3bf5dea42f42cfce16d0c26025
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, some hosted on compromised WordPress sites, suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a number, a common tactic in tech support scams or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=a+quiet+place+2+cast PDF link annotation
    • https://srmhomes.com/images/bulk_images/files/4170859688.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613396b7329e2---xiwivawimi.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/16207313104.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/53160451544.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e4e8f062---jerawaguta.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161430c16769c2---61803718894.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/62773718482.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4b86837f294a312b94c6c3f1b7dc4fc8/56928048749.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/96313422834.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/2147927337.pdfIn PDF document text
    • http://tchid.net/userfiles/file/lowimat.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99304481577.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/guvojexanuvexej.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/8622388710.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/35670595217.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0c5de649---xitaxuliladuj.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136027fd9b44---50915783541.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimegoribemi.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/55404406364.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_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 16840 bytes
SHA-256: 9ecd15eee66e0afee713151ae35b2a323a4a4e3d9123f02bc3efba38d991fae5
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10392 bytes
SHA-256: d1858097fa55ccc52a89ee3f50aa06740b1440d1457e77b4290e9407b3ceafad