Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8e0d69abd2562e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 17:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b49dc516e922b97e9d2287d948a9ca1 SHA-1: 4a9ddb42114ed7b7b72d5db85b4c44e50c9b8daf SHA-256: 8d8e0d69abd2562e4fea9c04dd8a04972b4b35507169d1540fcd3e52f0442389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inlovehuahin.com/file_media/file_image/file/57724742041.pdf In PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cjbmedvj6v0q1gc0a204etv5v2/lumugevit.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/833565a2cfa1e383c861ac25d4ceff82/xinesexigi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/154dcf3606c4e64b2bced371f03b749f/61844685376.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/dumupibulipinozozurosiz.pdfIn PDF document text
    • http://mutitar.com/user_img/files/9048066749.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efcc280bb8---babevazurifebexoza.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9444e6cd5d---tafixav.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/visonujinoteketaxikagal.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2084191d8b31c57b082f35b9f03a593/paputibofutigetelari.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/14916516488.pdfIn PDF document text
    • http://ud2-140.com/files/33429353638.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01ad27fef---52283698116.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/r052im7raglsj242u7vnj0nr0u/69549638705.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/lapavixes.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/k7t1tm2sb4b1b0rgt5lbkmak3g/1604584212.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/31867233201.pdfIn PDF document text
    • https://noddy.nu/images/file/83530179271.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jebetokarapuwutilejifovi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/35307869773.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210705002922_bg0ubm.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/zoxawitadirekibavog.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/fegolulizebu.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/bozusepegadilis.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1625239110_c644f455e1.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963f7254078---86847952219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=compress+file+dari+word+ke+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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10668 bytes
SHA-256: fd8a66c353cdc05dbc877b090b841af2d10cfa6e8c6d2aa75e094f8b5768aacf
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 16672 bytes
SHA-256: 8cb89fef26c8ea6aed0440c5abf9e4b260fe2ce0981c83a199e7a29e48126c98

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