Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38cc2f2c0304f13…

MALICIOUS

PDF

92.6 KB Created: 2021-07-24 11:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6d3c9a56cceb3616b022f823cc80594 SHA-1: a2cb5fecd720c81a2ed6514bc4ca615ce2731123 SHA-256: c38cc2f2c0304f138ee7c3f4fecffc7a790f445dec20e0dc8c84bb27fbcfd4a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to various URLs hosted on potentially compromised websites, indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. These links likely serve as a lure for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/be791ed95e6d2fd66fb1ff4ebb508829/29505334863.pdf In PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sibajidanifiperepuzi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/84781557012.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/55eed3117a34060c6e32644825118440/42528844578.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/27399713425.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/ditabogofivalavazo.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/33080223087.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/fibajakepajudal.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/54653995234.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9601d67a721588b5a7b4e4f080537f5e/fawatasabodolovim.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ae91c317d58e470ff7831a4ab1e83975/toworinimiwopovom.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7826d1d14---69489173930.pdfIn PDF document text
    • https://buyafranchise.org/files/files/81217795572.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/42977478817.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/64788530851.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/727f13bba5bf0bb03e03d7564d33adb7/mijixusolijadexoxek.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18200a168---sewud.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a566d422---zudexusazidedot.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/83689281077.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b8612c962358d77a98be48c2b05f52dd/vinaf.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/kuzuk.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90497299429.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c50da6cec---gunezuwuwepu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c0a3mr6a7i991mqeprf1i2r9jd/vulunuligude.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u3c6v4ioihnp1otjtjq8qe2eht/21115871839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=metodo+guitarra+espa%C3%B1ola+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 18712 bytes
SHA-256: d76a931fc64670873b4f2b299b7020e047172f26dfc1fd53e29b60bf1d1ce1a8
font_01_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 10868 bytes
SHA-256: d724bb7cbd7a58feabaa234182d931818603218d0ad1648fe4454e2d152080f7
font_02_sfnt_off00014a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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