Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b960de0d4aeffa8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 05:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f6b3526931d74504502c47253abc937 SHA-1: 9011c8035b39f615b7c97b510e29dd505d67ac8d SHA-256: 5b960de0d4aeffa84d2ccd429ad5775580004119af43c6593913d3636c82ff72
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files on various domains, strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://demetraproject.eu/ckfinder/userfiles/files/17679721398.pdf In PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/46162977792.pdfIn PDF document text
    • https://designclarf.it/file/potafozanasujabuzixuze.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346bb766f53---11103392557.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/17012972038.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3a50eb3ba7716bcd3b7256d710d26cd0/10228127409.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/rejibinapolukefisil.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sogonanomuxobadobomaz.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/74935597772.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/kitorexuduripufidoj.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e8d9fe5db3a81bf62d18649e2a33bf5f/loxazumopi.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/16073661547.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/10576007459.pdfIn PDF document text
    • http://dogable.de/userfiles/file/pixudodogivako.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/1881896632.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/35126680021.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5buscpe4pfpknqjf4dkbb1urpt/xojodupevajufitorobop.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/migusegasunudujepusaxogo.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/mijiguzenotoponokalum.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-5/20210905002512780264.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/panepebulowu.pdfIn PDF document text
    • http://foxhill101.com/userimages/67635810442.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/dirujumugirewo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wawosizisidelofutamigenew.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/55957885028.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/2107959872.pdfIn PDF document text
    • https://upaspor.com/resimler/files/49865110853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=control+parental+para+androidPDF 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_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 15872 bytes
SHA-256: 094f3c5ffa3f02e8fcc724c452c663fab368037625587d6470cab9d7f67d900b
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10248 bytes
SHA-256: 19051fbce5b14168a2cdd8abc1899bb4d5285e3c23f7175a1ca00434c41d1c9f
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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