Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f556f127494a4dd…

MALICIOUS

PDF

77.7 KB Created: 2021-08-10 05:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dac12523b7b9e47c4f99dd7b6ac1d19 SHA-1: 9c9efe36a0c4b4446f510ee54a34fb9f84a7b438 SHA-256: 9f556f127494a4ddd4a324e29a501edaa22ea45e9473fce7991df094be1b605e
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites. These elements suggest the PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://veronikavilla.hu/userfiles/file/dofamixilino.pdf In PDF document text
    • http://aps-mes.com/files/file/papetoguwepatepilemax.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hdbad3vo8aejsta6clptoj3jb7/33005105045.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cddbdaca07---sizafekebosoxuberudekodil.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210804_102153.pdfPDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f333d874f---91313813357.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/pobilabulewefe.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jufesikowaparuti.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ada92332a2c---paselomeguzelik.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/64935645711.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a99cc87e5---2079012994.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e39bcb2ad8d1fc9b13374b00a62ebea7/80536371454.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/jototosuwutimonigu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08bd66cda1---tagofavutividunapo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/34367130d3f4ee2c07926aa65dd6f025/mugogumekujisajakekotas.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf06a2481---nugeg.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h3sfjthdvt8u76sbl96uhfgvmb/76266883861.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/56988821583.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rigajetu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f0b03621---15033401717.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vegepabexajenu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210529051212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=suit+punjabi+song+dj+remix+hard+bass+download+mp3PDF 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_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 11644 bytes
SHA-256: 97b48b3cc741c57b5fdf5ab8f05db77cc1b441638b0950b95bc930679f5e7b7a
font_01_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 16836 bytes
SHA-256: fb11ed3a5955ffd9c003cd6fbe66a1b058b59407fbab32dbc5e654d9714b3e85
font_02_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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