Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a54e3c51bb81deb…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 00:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0afd8644ce4db95fda0855458d23ec68 SHA-1: a299e147c9b4e4d14bfe8fd0106a12c1c698a8c6 SHA-256: 6a54e3c51bb81deb3a2e0d05c88d707392e049aa309a2d9a2abea6cde639790e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=hillary+clinton+goldwater PDF link annotation
    • http://makesrealsense.com/ckfinder/userfiles/files/38200442159.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/60775900167.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///40682964873.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/20084809668.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/541f020a1f80853c91b3ce640fc71068/47615659775.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/58719292176.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/68541670012.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/mokosuxozorexetusewe.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/76288692259.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/xozofogajarogideleno.pdfIn PDF document text
    • http://limoride.net/gallery/file/46531308776.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/nalipoz.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/79681730310.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072391db8046---18738286924.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3886f23029069b3381512af5dc33d19b/12977728445.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/melujaxev.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/naravegadixewavodetut.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee892eafb---biloxarafe.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/41296232424.pdfIn PDF document text
    • http://miwon.vn/app/webroot/uploads/files/18118996247.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9e8f3de1b297cf8621e61c83246ae03e/68080184580.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/98416518290.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nabarer.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 17876 bytes
SHA-256: 9f104f81e3a521c5a79bb1047017e1233cec4fca033d54bbf8b6fba66e67a526
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 10568 bytes
SHA-256: a6a4d68d033262f415a7e86f23b02e5a82231006ce3ec5185775205cc6260cb3

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