Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7385c7bf4b8cef…

MALICIOUS

PDF

95.7 KB Created: 2021-08-04 12:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ca24c9aeae43ffa852084ee27b27f7e4 SHA-1: 4d847f0814618a469fe66be60ff79aff83261f72 SHA-256: ca7385c7bf4b8cef7f9ea17caafa658a14516491230164fecf38721e04e41c01
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=macro+download+free+fortnite+pc PDF link annotation
    • http://cosyromania.com/media/file/47079281883.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c987c5dd01---muvira.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nesilorabemi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/e92d1f2cl5gt2isj3lcrou0j1s/4327312591.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/texorubifezipifolemuv.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/76410747156.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/61893803544.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6da22169048680cc45124a4e2e89548/pavetixasidibizazapidep.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/temebiwi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8fca62c0---gadowekupifubir.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/4b92feb10c96b0b01671039748bf47da/lizagugalapogibezesuse.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/66446067144.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e834c3510a8---zofegarerarodabizowa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aadc63b0530---xipazuboxesubega.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210510231435.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/melegazovagimuzizitipur.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/wovuv.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/11695776122.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f1c8d6ab---jajosubotedibok.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa504e0c350---gudurib.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ce36b9c4e1e9a730a3c1c0c451236ea0/gamepawasupotaj.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/41600944349.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 18888 bytes
SHA-256: 6291f9d549927e8d416918d65b6adbd1a81996c6c2ba0c493463aae2751df4ae
font_02_sfnt_off00013f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15796 10524 bytes
SHA-256: 758fbe805b36ceeb7f27f38e47d6fd0d642fc69cb0d4d68a933098198982e60d

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