Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fa90bd54261644…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 18:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 311bc2eb9a8bb15212cb2f32475d5fc0 SHA-1: efc93f965bea6ff916dd6fe34ea8c58d484208a1 SHA-256: 99fa90bd542616444b3e5b012de26e2f8a89d5d70bb55294fa931ef2578d1a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted applications. No scripts were extracted, but the presence of external links and the heuristic firings point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=thoptv+app+download+for+free PDF link annotation
    • http://1544-7419.net/upload/fckeditor/file/31136306227.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8eee31f00bac87e0864114e872cbb78b/14947230998.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tibogonugewuwafox.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/sajilolulu.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/watizenotawase.pdfIn PDF document text
    • http://langyupharm.com/upload/files/vutomepejidiwamajose.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/jasenodafufuw.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/wudutikutuxevejumupulenin.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/45253911292.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kadufusigimixodifoboboxi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/489954708a24392d2c957ef681bda46b/vuvovaxuvagi.pdfIn PDF document text
    • http://synhbio.com/upload/files/fizasozemirufafajurinon.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/812593600.pdfIn PDF document text
    • http://laduses.nl/image/file/92215167079.pdfIn PDF document text
    • http://taxfreepoint.com/file/jadovifes.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be52bbb19---42120228081.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wedowozi.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/rapibozunilipepiwoj.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/77406609231.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/dixevakatakuzizoxufugiz.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/56806883314.pdfIn PDF document text
    • http://klemanpince.hu/files/file/gevizoti.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/fogatu.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 18052 bytes
SHA-256: 794b9f1f37adc016101bda2a12c865dd4afbf5e002bd3f5cd7b4c10df22deaca
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10452 bytes
SHA-256: d3873166048878db23e4b166014361595b4c6aa2056092cb8c0832da6028fc8c

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