Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd5245fedeae9be…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 13:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40f53079350628f2c9769600c986ab86 SHA-1: d490ce187e92d3605d710c429fb1add637598fec SHA-256: cfd5245fedeae9bef9a8db91f541ee357711926123722ce1b7bfe825e5586a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to malicious content, consistent with phishing or SEO-based malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=philosophy+books+in+english+pdf+free+download PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/74gkldggqlmf75h51uc8dcu7ld/xudebogifitu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/pepewojoxilotenutija.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/67177239485.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/56304250202.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/26742282412.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fexawikeradele.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vatenapazowadabobaban.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/41767425638.pdfIn PDF document text
    • http://araonline.hu/uploads/file/57516831801.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/672ac1965bea0d61b1689229d1d2b3fe/kizunusunowu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-17/20210817134517858975.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a37e6aa87---jitomiregudilave.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/zasojojitaw.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/kumul.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/bisurokivatitozol.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ad808d9e---paxikafasawetituk.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737262abc0b---wimipepex.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0f1fd89047c29fa5ab798ee86e505b76/nelebuxamaxofofokema.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fifipiwelana.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/fasokoxapefogedizurezebe.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/dediboxokowusododez.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/997230239.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/tozepezokizukanowuzow.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/2299240670.pdfIn PDF document text
    • http://autovoda.ru/upload/files/39003616489.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e513e2af70---befobowurapasawukiferi.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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 11112 bytes
SHA-256: 27577b47df80cbe64e1d04091cbd085f7fa0d3289d691130e359f7db707143c9
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 18792 bytes
SHA-256: 44c885e2f05a8d00e6acc0e282282f960e0d04fd9dc7e6063d045b4a05f21c65

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