Malicious PDF — malware analysis report

Static analysis result for SHA-256 9513ea61638d8e99…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f84cae97397f48e6a9e7a00257b50669 SHA-1: 274026441a28da39b3acaa65012902c9e8d1e3be SHA-256: 9513ea61638d8e99624cc5ff4ca1c95aa22b0bb271ea863b0949cab71aba5f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the structure suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://superlitefan.com/uploads/files/zidijumeboka.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/158590764660dc2ecbd0991.pdfIn PDF document text
    • https://thepainter.asia/upload/files/10349631293.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wovarejesuro.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9e08e0a53---puperuguvuzi.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/vusezotaxotuk.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7b9246b0b37e75d379ca5a3288f0eca5/tezokabi.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jabidenometotuzuti.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125046dcf032---donolofosakijuv.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608721b0e6b79---bipofijupevurufipi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/pbqao8bjutv8ql5ajbod1inuhf/laretunezopopatirowida.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/ruterib.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/63208023057.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/r9p3khi26iecfjf3kb1moq273i/gukewedixuj.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kapasoxuwazebibaresef.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1b86e47158a7bf631a840599685f25c0/jusexi.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4af4b18be87020c20d7e0bae5770c83d/dudulajutanum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6fmd793q68g8sf4qpvduuehc1v/44528855275.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/51445629980.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozujegasafekavegoregavug.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vg8it59e931pe9455pqee8egd8/boxijeje.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/66693399503.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/birume.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/givejozavoko.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/lisatijivoxogiteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=short+stories+for+college+students+pdfPDF 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_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 17064 bytes
SHA-256: 08687337293263e0484de8bb9a5cab8a175caf1626d9990f9638c6f9c19e59d9
font_01_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 10912 bytes
SHA-256: d807af0d597f047096f5e965c2925f0aa7a5513b81303f0e2a4bd5ce43ed453b
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1