Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e9a4e88f7a41f2…

MALICIOUS

PDF

95.3 KB Created: 2021-08-07 02:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a329422d01694b41639c6ff76cb515b1 SHA-1: d672f64f3bffd07317bc1fe65ccb41db6d82a063 SHA-256: 91e9a4e88f7a41f294a5f476c1e1a016cd6ac3acb89fc8c4d3c7abade76e046c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://m-s-g.ru/userfiles/files/kugafaramubaxor.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e96902e86f4eb3f7ff0ed52bda44dda/fesixiguwetefogifexepig.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/39104207170.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/1490293002.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/970813dcbd0b802dd6d8c811f6255297/taruwotijik.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/vanumelunipifilobem.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/egn3ee75d9jba7r5usoosibqv8/43732018758.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/61215020600.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d877a07a7---83892863685.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/fodutolubewega.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/32b1a9c144bf786791318152b0af733b/83980002166.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d086300d591---piluvorive.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gejetenepomumojedorutipa.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/16470487488.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/xavavem.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210716165546.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/55301693057.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b141aa8119f---nijoden.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/09c918408d38680332fd5a9dfcec1645/89973103594.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fijozibaze.pdfIn PDF document text
    • http://axwelindia.com/uploads/rukavu.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/58613027654.pdfIn PDF document text
    • http://guchenes.com/d/files/82282925485.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5aeff99d1a5219efad835d0c6e33aab7/14317242257.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609892a8ed907---bizabipufel.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd501d1cc93---56552050391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=que+es+oracion+simple+ejemplosPDF 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_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 10728 bytes
SHA-256: 0fb75237227bea18622a22ba126b5a4b4fdf2ccecd37c5053920c37b5d011521
font_01_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC6 18284 bytes
SHA-256: 969afd6f4766789a488b7ef6e8941cdaf833d2bdd2294bbaa989f7a25c0eaa41