Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d5c57c8aad2535…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 11:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 953dffe2a27ac270597edcac47f1ac49 SHA-1: 5d57d7e21ec585ce048c5967e5fcde2cc2ceb3b7 SHA-256: 43d5c57c8aad253580ff96e32274f08d2219335e75df227545f2b72898a74e47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1ff49a2f---gisotalumajezalirivizo.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/gobiwoxavadopiwupuzonor.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/jupusezone.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/42604471135.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304bfa98bca---5783816463.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/gezulowuzuzogelibudu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/65904791966.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/76085565852.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/resosagox.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/28868203696.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/78459692035.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/59713473857.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c33e9dad70---ninatulofube.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/gixike.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/u2c7595vdob10kmo3dmvg1rmrh/duruledikezifujo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481bdf7ba1d---fafewuvutavaxaforir.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/23341123481.pdfIn PDF document text
    • http://sentralperdana.com/file/90221205111.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/xofuxoga.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/boruf.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/70000955357.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/11201853343.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/62560452904.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/87963593978.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910155109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sim+network+unlock+pin+galaxy+s4PDF 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_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 11364 bytes
SHA-256: 7f8778db403d91f877b3a124bab9a1930864ce79d2f3a2aef6923c80ce094a58
font_02_sfnt_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 15460 bytes
SHA-256: b0da00b33885350620f2063353953b2e4fd92ae6aae08088d01e76d3e80e01f0

Open this report in the interactive analyzer, or submit your own file for analysis.