Malicious PDF — malware analysis report

Static analysis result for SHA-256 1015b591b475ee3a…

MALICIOUS

PDF

74.8 KB Created: 2021-06-14 10:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e9996f832defbfd668d11f5c289cb0ab SHA-1: 568c4ddf9ca1215c9fc554ca1602d1c39f1ac6b9 SHA-256: 1015b591b475ee3a8652f24725745d8c1f59b622315bb897bd78350c7fd14ad9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of numerous external URIs and link farm indicators strongly supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://pistant.ru/uplcv?utm_term=ishare+tere+karti+nigah+status+video PDF link annotation
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e738db0e7cc99091ebd6be738f653995/86037748082.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899687ef7e---bogetagivuwo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/335d39a488ac0d22cabd2923f3ada265/fevixatuj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6192f75629f95cc0eb5f8025d474d58/50049317568.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5654e4ecd---1047066535.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97c51a466---laduvajomabasodekufoxe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uc9hch0rkf00gq1adf4kjq3v80/dipemetedojiwaliru.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/51ee3cead31e7ec892355a2fede9c9bf/kotoxatamudunarufazu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02565dbfc---siguju.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b066f8a2480---11139180930.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/87178759809.pdfIn PDF document text
    • http://championsview.net/userimages/paresa.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/39851151559.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c01d550eaac12bc7a5e8896d235496a/denomivuvofagadagi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cb8536fd33023ee30807eb725896f6b5/52576834059.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19594038b---21307438355.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a21263f62---98128263048.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ohmrc3bme611rfihd74dvc7o86/negupagalomegixow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 5116 bytes
SHA-256: 30ab9f61a8cb96aee6f2ea124cc4c560c90208c7a19ab71fac44d43591aa5439
font_01_sfnt_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 2044 bytes
SHA-256: 28336a0cb3f8e641e75945af3d35324194abd932e21d2bc38800f63db353b10a
font_02_sfnt_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 9952 bytes
SHA-256: 916afff99d0ce0dee2524385480014a946d819ecc584515d06d8e27b89a8ffa2
font_03_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c

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