Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdcb857d5a2bda9…

MALICIOUS

PDF

87.3 KB Created: 2021-04-29 00:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8e950b859bcb4127b5003a6f870793df SHA-1: ad5a7482536482908af4d419d2d8afaa990ab597 SHA-256: 3cdcb857d5a2bda9fd2fe32c4a83b0610f1389dd8198beeb1685401e64446fc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9344a1fa05850a4ff5dee24bb894c6b3/teduromaligajowiki.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/829b760e4ef7b4bf9f05654309ad5047/72799001846.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f530e46e27---78240455543.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84e40846b---10796732786.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd71f03290---44589662467.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081602356bf2---mazadelerovojozi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf1ab3beb---siwekojomu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6d451891---daxadejipas.pdfPDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c1c7f647---6821436189.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6292b1026a18a9a24f0ea6e50726071d/46855631180.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e478db550eab37e7b6b316f2718c565d/85484957331.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/945512d979dbd4ea8a0661f562f71f1c/pepovutiwevevuneb.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5ba47733cd28bc78bab8a2fdb349eca9/verefeku.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c9fa8d0faab9e9138b349cac8b1b1955/79846285842.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c5637b64---zumojimetuxumagudetatumu.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a477501---zeduwolikiru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=atoms+and+molecules+class+9+questions+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://scripts.sil.org/OFLIn 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5476 bytes
SHA-256: 8466f41601d02e0d92c1041b134aea068b5019cc7dc3b665720f63b0ea05a696
font_01_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 11616 bytes
SHA-256: f0f3552d07ec15ba71553abc8b3fb3170f902577df28a1065fc4933350f9eab9
font_02_sfnt_off00013a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8A 16176 bytes
SHA-256: b45692dbb6eafec693c1e06f3204f357a9190be135031dd6127fe9376c658ffb

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