Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4488c7562e632ad…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 05:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82fb62918466c16ba769a14d4e68494f SHA-1: e661ac61457ba56e2bd009259edd791cad78790d SHA-256: b4488c7562e632ade2a2c6b01fdd0ca1ec9e642dff55acd0e2824092408281c9
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. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF's primary function is to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=lincoln+pizza+oven+parts+manual PDF link annotation
    • https://marathonlaval.com/userfiles/files/79995852678.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/68369485092.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16080489bab002---lovokijukodis.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109010429158396.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/puvememan.pdfIn PDF document text
    • http://cga82.com/admin/File/46886997672.pdfIn PDF document text
    • http://mobiliteit.nu/files/42263467305.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a70cb74bd---33144191995.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f8459fcdd---23442940532.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pupad.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/36134009884.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/26020502025.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/96133016102795d4fce5b6c77c04fc0d/55715757067.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ruvafu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/11728361414.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/21914479964.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/xumus.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/rugafipowi.pdfIn PDF document text
    • https://basisnomor.com/contents//files/2276546372.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6d11a84e---10830541624.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0rqh1cai8cki4sd3lvpq6its80/mowufobil.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/samonexogorisa.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/siwesotizokoditoke.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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 17648 bytes
SHA-256: d6f1676770fd2f353a51ed599bbd7080a8840553cfa3dd0ed399e21da25e01ba
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 10720 bytes
SHA-256: 4cdc63a78330499b767139afc6828038f11872e7d91175e5fdfece1dfd4cfcef

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