Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec633ac8c8ada50d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-15 12:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ebd97b23de981b25bf4011f98f4c9fe SHA-1: e17af3414d07cadb35f998e6965db4b2b62a532e SHA-256: ec633ac8c8ada50d38f1e938cd99e76dd2c7a1a7c67186c492337af0d4722dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xaydungphongphu.com/uploads/files/54816415901.pdf In PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/solulumagakuvojazowofap.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/85862cc64e789d39623843fb3109765b/sepubuzuxipufabuze.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/72299968232.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcb23e620---ruxubigokopikozezasuzavu.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5317e209d46405510f5071b9bc81fb52/32148807614.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/fde60b40035f7d4f7e6bde5f570097e5/nugukewubodef.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6090cd6a0---35997267644.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/84744138986.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mitujexijodamad.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f80cec0508208093c9c8a9ec566f1e59/44162088283.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b659d93a6b8---63615278355.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pojewizepoxokadulaj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125a2493da---levazolefejiwapofe.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bbf17f1a---temeziberis.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5efd94a525d22a36b0ab4bbc11990a4a/50409318748.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3e6d4a71185d4e0dc2e5afeabe36ced1/fuxivogolukizalukut.pdfIn PDF document text
    • http://dimexautomarket.sk/ckfinder/userfiles/files/faveboxigapu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/d6a32ecaa898a02d6602d543a5e672cb/81621164783.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608401ad21527---mulikulufilij.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/tutiparifed.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2367825626.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f713d9d6---tixosokutafufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=movies+related+to+superbadPDF 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_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10580 bytes
SHA-256: 5db8369929baba937c53d15463e4f9e2fa378ceb0ac05078f46a31a820a68747
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 17900 bytes
SHA-256: a91ce3b5acf62c3374913eded33c9059f0d4a54a961cc5a23f8493d006fb6f4a
font_02_sfnt_off00013aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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