Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2a841a19389893…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 06:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ade7c4c86d82b91d5ecadf770048b184 SHA-1: 69773ffc1711e4d0cffa272d554730a651d3345b SHA-256: 8e2a841a193898937d3613f4f7d48b60490cfba25d442379819ab86ffd2d4478
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://curry-box-deluxe.de/userfiles/file/39700246356.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0c311cb54---51916823283.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e40586e4c0568f8e768a801a4dd2346c/67671674245.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624542313.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/55703262615.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c364b1e0498---61741200740.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4d0aaccf4eab9254e21676cd29e2a3e8/20867168544.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/fozonebetufufotiwa.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc5515650---78501263547.pdfIn PDF document text
    • http://proxima-design.cz/files/file/79271092589.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/76148067738.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gabajunujekewopibavin.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/873c75a421c613361b3ab5be6deda2b3/tokewedijakuwamitud.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/89829271453.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/lasetezefurewutepafeguniv.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fb7e2d3fe60c41489cd76e0d75041dfc/18678962791.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1eb27d630---zoxawutanivitepobibeso.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd742ebed---lafinure.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/04bb239ddd1a7dcab4a51c509ffd8599/41328329053.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/befug.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/suxovujobenapudip.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/61260337749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sinha%27s+comprehensive+anxiety+test+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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 17284 bytes
SHA-256: 6746233f8ad8c2e7a18af13b5b4a696c9333e46bd8c1f7090bd79f972d73acab
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 11228 bytes
SHA-256: 10d2b6b6ac1bfd1f11b0e58647a995f11e4f93ab7a7fa76d08c809061e93d3e9

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