Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c76236cd4d5300c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 10:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 287d2e2170940386e687171fb6ac4554 SHA-1: 036eb32ea0f599822600a6f5a54c6c8197efb06b SHA-256: 7c76236cd4d5300cf8481bb6eccb61771b7575874535c9c73f0cacb0c44cf72c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cb933207594484123c3e5da0d1849a98/fawakegosazuvavakax.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hqp4nn69t9dumqle44ohs67u41/patir.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c45a51c0---kegubirojegumikadegesese.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3a0edaf7---73863995922.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/8898792606.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/59836994192.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/29114543684.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/subosigaturiza.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/23688572803.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210730100208_g7mfcu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/732062ec8c253783791b22f35e95965b/mimutexokenoritamek.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/83745181690.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429104224256108.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4dbhcgcjvhqtprckrvvvv5kc01/zipebeza.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fusopevaje.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/40623477389.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc7bf97baa---34772028022.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fa0ec448---kozukatofu.pdfIn PDF document text
    • https://langumeistras.lt/i/File/sukikasogazoxedegumuf.pdfIn PDF document text
    • https://rotherelectric.com/files/jizevasapef.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/85586188120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=step+by+step+watercolor+painting+pdfPDF 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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 15792 bytes
SHA-256: e4d3efbad884f47a7981f600e04ef1abc99ff4f9b1922405e7175dceb510175b
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 11212 bytes
SHA-256: 9b95de2a079388cf00b432b02a1c675f73ea7a5b3b12f6ef4f88471fb3649170

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