Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff62202f363e5bd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 01:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b607ebb344abcdec74b3e597f2d1fda SHA-1: 00640234aa5a1fd261b662433471e456377fe50c SHA-256: 7ff62202f363e5bddff08b69188e4f6095adce564ac18c00a2f2f3ba5651a11f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the file functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to manipulate search results or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://booknowrentalimo.ch/userfiles/files/71156330984.pdf In PDF document text
    • http://www.farmaciapenil.es/userfiles/files/23601949425.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a7e63a3e9ddf301f140fa1d9f7dec653/50350993380.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614410604e114---80826149851.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/89591911339.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/niwujepixomaxikuloga.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/92376983781.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/dobunafemogisiretepufot.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614114e55940f---50213810735.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/jopowajixadogubazuj.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/54890706212.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/42030608657.pdfIn PDF document text
    • https://tckontrola.hr/files/68697671025.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/58560864853.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/medekaxavelonik.pdfIn PDF document text
    • https://ptogel2.com/contents/files/bapejugiwekutalevawam.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a73755ac3---fafatibavopotilodizo.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/semevefosukiz.pdfIn PDF document text
    • http://kdekdyjak.cz/data/senefanakolepon.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/bopokananobabani.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/42688496074.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nojawojoz.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/34414939753.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/15144733870.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/joxumebezisomajanafevare.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141aab477771---zekuwixufidabuj.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/84456403965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=most+used+phone+in+malaysiaPDF 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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 18576 bytes
SHA-256: a7cab6f0a1d5549585beb6c14845999cc50968b61ba78a3a64df8a153bd68ed3
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10764 bytes
SHA-256: c806858c05eace202fea07b0cb913a56ecaed845db834cd213e2a1c986459ad4

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