Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe55778ca653ec0…

MALICIOUS

PDF

86.1 KB Created: 2021-07-16 16:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 050a6af1620695e9e04033751b5cc4fc SHA-1: ccff3fdc6c486f6729a57ed713fe885fdfb85025 SHA-256: ebe55778ca653ec098aed84ad344d407284588ac53b9c2ba6142993f0c3f9c9a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on disposable hosting and the use of UTM parameters further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a81829bc518---risupezowodilotejoja.pdf In PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/vuzixule.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f9f95944---40395095030.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/35422000331.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/74b81398e3adca5945cf8d59f0ece70d/44912427694.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eaf308e56---91461953477.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0935545b70c5a6bc92a2a3b2930eb921/37541102371.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/vaxopilosekalej.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ec9169f5---rakuj.pdfIn PDF document text
    • http://thegioioto.store/upload/files/78654562288.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/62981107532.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e86de9c27---47094557158.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e49b8a60---timujalozowuteluruluku.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/jamax.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4470ae110500eeef1b1e15e761cfee06/tukakopuxa.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tusenikuwilis.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201f52f89b---14727319001.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dba09c9abe939cfb7a4f499bae55a137/43067025384.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/73747e85812255ea07fdc980bb4f4bcf/21993880032.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26f2e0ba8---bawiluriwolajex.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mulufimako.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5854ccf18---zubidemitolatavufop.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60ab6907d---vukenumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=latest+baby+girl+names+starting+with+sPDF 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_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16500 bytes
SHA-256: 2bdc42a7d2d6b531ee240ac0b3c2b2ef4c730d7d091b88e4f1622bc3a1350082
font_01_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 10732 bytes
SHA-256: f346280f3702621a261b95fadc78ac11e68c8c19c97b99ebf56dfa0db1d7c8e1

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