Malicious PDF — malware analysis report

Static analysis result for SHA-256 543dcc4cb7887990…

MALICIOUS

PDF

88.9 KB Created: 2021-07-22 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fc2a8157cc4c1762fa1562cb5fc4643 SHA-1: 5e18fe0e63e67fec58d7834c35b9d0f0514f8629 SHA-256: 543dcc4cb78879905e09912da1b4b2cd09595fa9d6eab1f839db5601386b3164
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/3c2c38ee44e7970682201d550180c0d9/durezadiluduperig.pdf In PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/pisajebamot.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5ae3cdbd74ce42950af5b4783c98937a/jemebugozomaj.pdfIn PDF document text
    • https://tappowine.com/file/nojijataxaxufuvaz.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/64116914487.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/76433560162.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/5793287948.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6024fc44a50d5c82ce500e1f47ea7e6b/somowemetimanedugena.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/xaloduduz.pdfIn PDF document text
    • http://inse.us/uploads/images//files/puloxawiwikorisitev.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/37752084333.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc89596a0---terejobum.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/munejavamanudodagow.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/de5e09127322a9a2e7e10e1995b8093e/94391069221.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/sezixoxeduriromid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/472f6bb1368310ad535b3130f769ca58/20366351832.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8309c0bbca73c9fadadb88517555f928/kazewuxisos.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da29297b3bc---jaxirojetokiruxaxi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/bdc186fc47b19b673b1f9da26d81bee2/57127829198.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/solanolisivokojejubivuw.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/jovuvumu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930f07cf80b---33068044419.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3eee87df21839ae3f9d8216abeaf3a8e/lobibuwo.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/vofoxukejowapatimo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/fb483816046323ba56b7848ffc16f457/65363840100.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/zukamosaluxukorosira.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/30256042744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+mean+come+onPDF 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_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 9836 bytes
SHA-256: 7c733d1420c9b7650f044a4b5257543dc995ae8afa1d88ae60bb84fc11e4122b
font_01_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 16404 bytes
SHA-256: 30a474f1e92feae263359042259bbb4fe5a299183c54a672d83538575c1a5a05
font_02_sfnt_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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