Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b47f212ea2b607…

MALICIOUS

PDF

69.4 KB Created: 2021-09-03 06:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf7c265c9c6c6588c849783e57a1a18d SHA-1: 6622612492d7092cd97f30a307c6504743089e75 SHA-256: 52b47f212ea2b60700927001c862de156d6bb909c6b6e70f5a05993335bee17e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and disposable hosting domains. These links likely serve as a lure to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://lambanghieuquangcaogiare.net/vietkiendo/upload/file/79632711529.pdf In PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tiladusavejazura.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/veloramujawejad.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nsp360dvogagg60q2v2gfaqe59/dulerexipenatukakiz.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/63b784cdf9505d08ab86ddb824aaf05a/widipopusofov.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/b4nbanqtjjjmdgiukpue93tgd4/19092971465.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a88930a2c613ca48ba69679a46cd729b/99640559337.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vawenijew.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/233b291ad70358441de71d351bf78dc0/vemavijudukijeruvilotawi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766fa465e6---95641948470.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/88040688725.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/vajakafebogetijozux.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/6957574116.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/11531183119.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/sulefozuba.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f25683ad787---96932510005.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/75140080268.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mp45v2q3uia0kk4v0f37sk4jn0/67071794142.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/45245770725.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/38108773589.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/47081173131.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/60361993709.pdfIn PDF document text
    • https://seerupit.dk/assens/file/nigupizoxalawu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b9041e01---towakox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=principio+de+exclusion+competitiva+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_off0000b277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB277 14504 bytes
SHA-256: 7c504d659f4db75f747c47df937ff7cf91b08084a8732191baf86de04482dcb0
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 11052 bytes
SHA-256: dd9192ae87053891320cd63e9b899153b2f4253c928de18653be5f9652177823

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