Malicious PDF — malware analysis report

Static analysis result for SHA-256 76447f52e5c48acc…

MALICIOUS

PDF

85.7 KB Created: 2021-08-07 02:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641f79f521c7df376c43cea375de7bf4 SHA-1: 28c2b5ddf7ba460a371576bbd2dc4b3d399ba7bc SHA-256: 76447f52e5c48acc37291f24b169cbc18c2d4b51328636e3573d4f42779423d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs pointing to compromised WordPress uploads and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' suggests a payment-related pretext for the links. While no scripts were explicitly extracted, the nature of the URLs and the 'ML_NYX_PDF_MALICIOUS' flag strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crysiq.ru/uplcv?utm_term=how+to+write+a+legal+contract+for+payment PDF link annotation
    • http://lawngo.net/fckfiles/88269871849.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/5282773471.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lojegufefuvugeripalidade.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160dd86adda200---95599772157.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/n1d635t8ffsjok5c5sb6hlv076/92789098258.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089eeddc0d8e---xosobujevisiwikajatatep.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/wedosofifiwekelisuni.pdfIn PDF document text
    • https://yellowstonewildlife.com/36933247298.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e24883aa9997a3765bf1725757f20054/8893900027.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/74233889135.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/84740769395.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/nedewene.pdfIn PDF document text
    • http://farmina.ru/uploads/files/gexijoraz.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/muzegufemibezedo.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/jugibala.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/69471890801.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/funevixawugoxid.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75949312771.pdfIn PDF document text
    • http://azizolace.cz/images/file/wumekidubefimukamo.pdfIn PDF document text
    • https://limsurdua.com/contents//files/55384863853.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidabexulekenudej.pdfIn PDF document text
    • https://bliznacite.com/files/xenilarekixojebadejokoro.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fdf6af3564b56dd4ae42e2b43785c2cd/13108135152.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2h11gp41lvrkimcugle96bf606/80371629257.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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16448 bytes
SHA-256: 4e08e19f9653a6f2831fdf9cd058db126da196b951e9d86c81aae3bee4a4042a
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 10848 bytes
SHA-256: 4a1653026b6a880dec85ad871a4282cbe901968037ddbdcb117585c082d3cec9

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