Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c9a88ed339a1ce…

MALICIOUS

PDF

86.2 KB Created: 2021-07-31 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a93c9c278d2959dd79e5d2ee784fce3 SHA-1: bb49d70155a64ca4a87612871afcf72c9f4e499e SHA-256: a5c9a88ed339a1ce9e078ddd548e0f0800ca5c37b09b3d03bd0cf4c7bcf8f1d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The presence of numerous links to potentially compromised websites and disposable hosting suggests a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request, a common social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ce-mi.pl/uploads/userfiles/files/bosabafaguso.pdf In PDF document text
    • http://ilkemymm.com/image/files/61507350731.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf4820502---14975549829.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532b713cb1---benaraginitujuwinope.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/68421a88058df0ea84449a5514f779bd/29839203092.pdfIn PDF document text
    • https://tigaintan.com/contents//files/pilex.pdfIn PDF document text
    • https://t2sc.me/userfiles/mowef.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/80c068959244e7104f126e6e79f8be1a/rugakesasogip.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/10763981809.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/94951547143.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/bedilalekesosaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94978128010.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/64840484964.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gipaxedudujezotinuxa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a8994fdf399e7b38a36ebef1309a4908/lebimobidosa.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/xawoneganesitanosufuteza.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/92403068885.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacc923923---45416446765.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/milene.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a6bee46892a5f3135056177cef817bea/kodeboxozoxaferu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/221689267.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kizavufisevoketilim.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d3cd4714c69cf487321de6753f111cf9/1508772468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=appsheet+tutorial+espa%C3%B1ol+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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10776 bytes
SHA-256: 2d53517b2028f3f0be3f6907043374131ffca6090b2ae34c51700f46b77a4c1e
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 18128 bytes
SHA-256: 78f32420d2e46b21cf6eec00674f530b6137eb6c1b0de2e952a32e69830f5baf

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