Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d03e8cdf48dcfb…

MALICIOUS

PDF

113.4 KB Created: 2021-09-22 20:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3513ccae364110a36d70476826f4844e SHA-1: cd0564522b337f1b7c15f9f00190c0095f56a97e SHA-256: 96d03e8cdf48dcfbf805cb74fbd47fa48cd1469d0d12729c78cf9c6965536416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of external URIs and link farm indicators suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=cheat+walk+through+walls+pokemon+emerald PDF link annotation
    • https://virker-ikke.dk/files/sobewoxoxebifaxopuwadilaz.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/40891359961371a70c813b.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nonoranavobezowugoxavar.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/17044064376.pdfIn PDF document text
    • https://masukpt1.com/contents/files/doritijikonokaposolefu.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/jinekugib.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613508a1698bd---fiwuvigakenumujifagi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/latibezufinixitenu.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/telesupenoradotojo.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/78353005994.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/paneb.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/00ekjto43engsdlntk7mm0a5va/burojimugitepijukise.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/rapepi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tobawimorexo.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/likenubitalowexaro.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614487159de89---vubejofepobepazigetuso.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/07fae8e64971e4b44a2ee15ff9c00c08/83086629464.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/59553136457.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/jofumakusosonazored.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/refatiwonakiri.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jebavigixi.pdfIn PDF document text
    • https://seger.cz/userfiles/file/98050950100.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/61700917061.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc00c8dea9---jukatewejaxuko.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_off00015462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15462 19052 bytes
SHA-256: 18ff5db6880798356a99b4593e2205aaad30d1717e7351287502b710fccc32c5
font_01_sfnt_off00018616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2D 11056 bytes
SHA-256: cfad576fe49f2e9d3cb29dcebc912bbf01a485844fc7e8dd87fd55d5357bc87f

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