Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8ba7bbc01e581b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 11:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3891f8c5182b1e81536a576124ab13d SHA-1: 31cf8dddfaa20054f0dc61a18f2aae8aacd09aee SHA-256: be8ba7bbc01e581bd05f5bc575332d71a527c4dedb7eb004293b779791ec69c0
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories and other disposable domains, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=redmi+9t+specification+and+price+in+pakistan PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff546e40fa---vutavukoxeramikigizok.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fifipowanit.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141de9ed65f0---pesoboxataxevolize.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/57067076328.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/taxizaguwidawezuma.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/16/file/20210916_134140_172.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/10310164404.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9476128189.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/140862207.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/93383288640.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/ramoxoxakopifom.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/436f756611878ee540baa554e5c8d70c/53110602960.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/97167594253.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/jomifatixukileditix.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/60554890654.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/40134565805.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbdd1efb6---75962868136.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/rajowajinerunuvinulipox.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/53884393540.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/kizimofina.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad664c43f---bosizeramovexaluni.pdfIn PDF document text
    • http://kezmosas.hu/files/file/waluges.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/57100241846.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/niwegimezanoxawisarodo.pdfIn 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://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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 18844 bytes
SHA-256: d34f065fd8e6275d80ed8602db2d90c767308a8047162e87ba55d08bfdf85758
font_01_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 17824 bytes
SHA-256: 466d377a67122357d403b26933daff5911ee6dcdade0779645b578b95bd298eb

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