Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b9aa7c78bb0ce5…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 18:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7831b8334d7006df64117783111ad85d SHA-1: 0c9aad7bf9fc4ffa2e33b5a4bcb5f9a87b2bae22 SHA-256: 50b9aa7c78bb0ce5e6586962d9abd99c4e499ce8db19ab73a1d87e05e533d267
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites likely serve as landing pages for phishing attempts or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/31abbc6bd456299dd2fbd6a7ea447975/zeribapofebifigo.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c26d97b6f---refupukidujumazi.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/papoleka.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/54482260606.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f95dd43d303---23084527163.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/gl6defjmm44btcj61k42eqn3m3/79611683314.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062800332034.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c424f9a992---29543770672.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f407463f4---55989150503.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/xawunilumixalug.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/turajulomixije.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/kavefojodalurezesezosozev.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0079980be886df1a62dbab868d31614a/65151602726.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/1023574406.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/68307361247.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160945ba8499f5---wekibulinakovowunova.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/risafutikopulofimafodolox.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/15288854628.pdfIn PDF document text
    • https://stopserv.ru/files/file/31760012186.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b619480a4aa20d81dd08b71ccd49a846/55696625867.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e3769e9---norinunusaxasoda.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872a4c2c2cc---11874396615.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/11503139435.pdfIn PDF document text
    • https://2acontractor.it/images/file/wirejupesa.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c41edeb471---mopusixi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa37ca1650---vepubon.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/womifefezamesefikedikijil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=soda+pdf+8PDF 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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 10032 bytes
SHA-256: da3845721f959170ab862232448369bf98fdfb797c80968380d84bfcabdfe83e
font_02_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 21268 bytes
SHA-256: 540b445c78091eb17490ba79e3f5040c798f58becbe5f81962aa24aa027277eb

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