Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac1e675a447f250…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 17:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31295915f59d47464de04a548277b110 SHA-1: 787766019cd2eef4bb37b55fdb67aa721f093858 SHA-256: aac1e675a447f2503233d6725bb774af0937baeda97cca5be0787baed7b0933e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=unseen+passages+for+class+5+in+english+with+questions+pdf PDF link annotation
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a257cdb69ea---24150447466.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/11287312825.pdfIn PDF document text
    • http://vo23.ru/upload/file/risegipasa.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/87822191339.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608616fee5480---72833331140.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nitaka.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7k7uq632col9ti3klld9o2iued/44926052287.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/7521928990.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8e71adf4812a25969b47dd2115e69440/xuvezujipijuxixakubimaxu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a52fb19f9---subosadetojedaxuruvigisap.pdfIn PDF document text
    • http://hflchw.com/upload/file/wesanizugelagelojeso.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/lemefitemudisov.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875850dfb5---69217834194.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/dbbaae362891862394d1c58aa589fd7f/89585402064.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/57233339889.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nunelewar.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/lovotitizipuma.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/patefujuwirusijujo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609114ce6da2c---zerabonekalejijafip.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qc48qquomj076ecqo7412joqj4/nuliroludoxevujikitugun.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16116b6e3b5dd6---tofijojutig.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/23658569095.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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 18292 bytes
SHA-256: 7231d20369189502bd20a0b5764d707f061b36646952989029201ae79d55e6b8
font_02_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 11372 bytes
SHA-256: ceb8f4f385f1506840d0cc5ddaa1b4429570333bdee5d39f10c3414d079f7149

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