Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af1ee63e0f4f2ce…

MALICIOUS

PDF

116.3 KB Created: 2021-07-29 23:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8f6756cae4834cae1076a19e502270a6 SHA-1: a74172e6e94397252c826cf9189ed1846375dc54 SHA-256: 4af1ee63e0f4f2ced560fbff7af2fad93ce56756873296e054bab2ea021fe807
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/68049467463.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/gopividilaze.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6aba6714c4bfc41364c645a8a75d7412/lewem.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1999fc0cb666c806b3488bd902325d8d/36043582339.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/juluni.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gijegesegobuxaxuzis.pdfIn PDF document text
    • http://canoeing.by/pics/files/24281250102.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f17fe31cf36---dabaradulobi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/28812407041.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/ragovigejiwizuk.pdfIn PDF document text
    • http://polletnv.be/uploads/files/17024397827.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16089329ec5162---jazol.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607051af57daf---41123094415.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b676e297c8---82547219480.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/konetatisovizip.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabb79312b---24108766313.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b784d4afbe2---divezi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280ecd3091---migetetomuxide.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/54333351033.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139bcadecc---xamutibimaluli.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/92667350341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=skeletal+system+worksheet+section+b+functions+and+classification+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A7A 17480 bytes
SHA-256: a40a37db4210019c406b9d671e9dd8c440b9e91fa2380cf761075cb5c11bcae1
font_02_sfnt_off0001a872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A872 11348 bytes
SHA-256: 3f139a917a09343b02622cdcde7a12980f499a2bef8ba447ff43717b7a9f37e7

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