Malicious PDF — malware analysis report

Static analysis result for SHA-256 7651eff43b7c24d8…

MALICIOUS

PDF

81.2 KB Created: 2021-08-18 09:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b96dd084f91ecd157d05d959b709d80 SHA-1: 19ffb7f3f91cbb25ff6a4918111236f94aff3f05 SHA-256: 7651eff43b7c24d83d0e3332c95a6222afce0da59904040e236e2e04e3e7dea1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The presence of numerous URLs, including those on potentially disposable hosting, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://oilandgaswork.com/userfiles/file/mosarokibubenimewa.pdf In PDF document text
    • https://farmaciasacoor.com/site/upload/file/bezagojilivewe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c76a3017cca97ed05c824a82cd77f907/84500413877.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfc83a40e---76910542675.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b293b56b67a---76834409725.pdfIn PDF document text
    • https://digireg.ch/upload/10131009168.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2c8886059a15be39beb58973d6f25616/96129153034.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kjdleq7cbunch2eug55sgnat99/52860775953.pdfIn PDF document text
    • https://altbuket.ru/files/95409870742.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/67854688923.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/1151431457.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/25h8k6p9brcsbjhjqf4rk53o7m/32292182570.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/rubekegeb.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/nepizovuvime.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jelakopik.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/resetebubiv.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/25165654729.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/pidizezorexirirudirubef.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/80313664379.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/1774543932.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/52352348695.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/digozolewifo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5e11dd2620df51e43acbeb54f37486be/28988701194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=5+second+rule+game+questions+list+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 11248 bytes
SHA-256: d18e6a62b295ddc2e3fb36844df50c03c82dc950f0db6edfe9530d537cb3e3b1
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16260 bytes
SHA-256: bd98a200831b6dabd52a320ce7c00976ee17c93c12561d758790f8f150a182d8

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