Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1810a95aecd3c8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-11 11:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9853163dca94232a335d375d35450a4 SHA-1: 5e5dd19f44caffa5c1947c50b6ec060760577939 SHA-256: 2d1810a95aecd3c89495afa5bae0c78ccf6ed7cd916a319e3e463e53fd8d028d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=as+per+forbes+who+is+the+richest+man+in+the+world PDF link annotation
    • http://njuhome.pl/ckfinder/userfiles/files/91943121055.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/730725251.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9f1bc63---tumavaxo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/70915136584.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/kuduv.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823f7934f66---dukifomoj.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/47099369755.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpo6mqt531sm400tv2so5lbb71/wolus.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4de17cfcdc---67419761616.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7ffeddab5a01b381ad5ee84cc0ad8512/18681519154.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f052ca7f---63285595044.pdfIn PDF document text
    • https://paperland.bg/uploads/file/darodeminakonipafopum.pdfIn PDF document text
    • http://castel.lu/userfiles/files/mitenawunopulikebavose.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/fagifezuzebolawuwusenazo.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/rubigevopasagaril.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/xomutesoxerojomenuwal.pdfIn PDF document text
    • http://whatdwellswithin.com/file/96784652395.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/88485819553.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/patozonuwugava.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/1994598775.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/684660152.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/vetidil.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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 18532 bytes
SHA-256: d936e91f37b37019b9d75cbf1e02bc8d91095d6f1a617ec5234bdcdfd954b882
font_01_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 11092 bytes
SHA-256: 2223347210d1c669a71527d363166cd009a921e98fc5aadccf9c4fac4573ac3f