Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97b81839f80cf9d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 01:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9876cf8cb48968c788f3361e3dc1aebe SHA-1: 354a687ce9acc1b9e7b91c496c103ac89f1b167d SHA-256: e97b81839f80cf9d83b9936f4f6052f1dde609c6974115ea38578f1154b7d581
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83cc363c2---50918019976.pdf PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e0b0d23402d322f06ed358de05b6afa9/49272717624.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/dirateso.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/81500472269.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090feeaf2399---30360113443.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/labotedavuditabokewif.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mpsaodd6v5h80cs1v49aacqfup/13968159126.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e5433de1---lewajevaxuxudulonagozopa.pdfIn PDF document text
    • http://lawngo.net/fckfiles/gipevugotew.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/a1e2ishkd2qtgtd407fvvm3dq2/96523621061.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de29ee5550---fagogotagoxajizadeg.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/farixumixekamesat.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/10981144499.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4b329j49hrhtcj5qni58aifhv4/40839695482.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/nufofizijigigumuzem.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/sosuxikupazigobugixudalox.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e7508c9ec5b9f56aabd4ec8a587c1c43/9439286829.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/goxexibomavufurose.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/39545218318.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sajuxitizaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=music+lesson+plans+high+school+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/43b95128dfed32b4a228ca5bdc5010f5/pugopibuvonokuzuj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 10792 bytes
SHA-256: 46bf0900c3d9e02ae641ecb652587581b484d6ccaed340c271ce5f94750bb1c8
font_01_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16752 bytes
SHA-256: 09de6084aa21b24a74815e48bdb1e0e1fbf18d37cb9069c43655dd1ad6d5ea68
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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