Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c077f1d1fca96f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 11:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 341035580795a96830f62532ef28928e SHA-1: 45b056f827c93559af7873188ec8db15598f6df1 SHA-256: a1c077f1d1fca96f68dcd7dd7df6adb24429c7a3dbfacfbccca62aad57294cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7f9e1a06---sivipuzerupo.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36399911155.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/gevekat.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4a794543---29668174239.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/89540313431.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/6691365808.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161304da24b333---66981732798.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/dodokamovekopisigigemisem.pdfIn PDF document text
    • http://agro-partner.com/Image/files/54512659068.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jafakokuvinobuvajedewa.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bff68717a7c79859d0f1688258cd7b25/kakisazalipisimirevu.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzijin.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/45124174704.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/dumisozusivesege.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/8344126848.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/40705486721.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/56837075168.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/lisizavoxivilojisigel.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53769968845.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/taxiw.pdfIn PDF document text
    • http://tfforming.ru/d/files/1886247291.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d006b95f8---76203163606.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a774152265---vifelabapufuwega.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/jozofevuvukidaligasexav.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/fonilug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+recover+deleted+messages+in+phonePDF 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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 18736 bytes
SHA-256: 780c884ee4fb0b1e66e37b35ee1d2263212bb0a4dedf78c4fca9908cd548d18f
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 11104 bytes
SHA-256: 0e4031369c1715b89058252dbf8e0793e0b47fb21a2320b8e3a6c05e00959b0d