Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65405b0a8085229…

MALICIOUS

PDF

126.3 KB Created: 2021-08-17 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e16c55c6f35d1f0715af1b7c637bd8fa SHA-1: 3c5031b7a58a03d666369aac40188812bd935774 SHA-256: c65405b0a808522900c5af01b4f11f58b9898db499eed6fbf24a5629e8b84554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL analysis point towards a malicious document, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://majorsagilekvaros.hu/uploads/file/mewubosefeturonopota.pdf In PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210625_7AD34FC42C358CBE.pdfIn PDF document text
    • http://usmleworkout.com/files/file/72957406468.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/51553179199.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/83853135206.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/89056114813.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61c4f01d8---kolun.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021551010399492.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/pivililumewatugugafuwure.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4493a631---matopunugezo.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/91793452961.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/74266941553.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/20163660535.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/bupuzasepukag.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/sejup.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/eb27cdb516d7faa6464cad3bc5d4daaf/93875242850.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/95012359171.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0okhok3v6omb340j8h8f521ul9/nobede.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f53d936e06849050c51cadb91d5b61ee/74013235618.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/3454914594.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/49152892128.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zuninis.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a41a5db2b5c775eefb3421c9509a13a1/5564466745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=math+nation+geometry+section+1+topic+4+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19028 11100 bytes
SHA-256: 547b0c60584cfac2324ef543a98f0a0e16d830cc521f4fdad8428f9b175b6ddf
font_01_sfnt_off0001aa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C223 16092 bytes
SHA-256: 645d62deb62b1784deccef30e55ff3002fd987ffcc98141c126b0c35a01d1e3d

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