Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5489c2ef9711e3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 02:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c9854242fe1f5c62b52209f27588ef1 SHA-1: 49a84243f60d2da11dda1e0fa10d220ac205ab96 SHA-256: 1c5489c2ef9711e320248c6cc078e81a446ceda5d86c9db8eec5ec499411b5e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for distributing malicious content. The presence of these links indicates an attempt to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rthcj9mjqhdf9j2bmnkr7ql25r/dofofirixudonibutuke.pdf In PDF document text
    • https://kingyao.com/uploadfiles/files/20210727_133643_2226.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/nefanikopomiwawixiketed.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/nesuwuxevuraz.pdfIn PDF document text
    • https://ridersshop.it/file/28253544620.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/dodaveluxubux.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c253274c18b---pigijatamadonomudulezod.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/sixoxuxomejujosukejodo.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/faruwojuruxawejorixavudu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm4pc816b1dnpcupipit9fu78s/10437869522.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de63bbb34---tixugimedaroro.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/povegudanupowurorijubakor.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/81205096912.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/57455022164.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/nanomineba.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/72020048985.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/eeiqhombhn1b17goakaavm56ch/29776239470.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/wumitoduridopub.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/440286d0af8ae814e13b70bdbd09a55b/tolotuwetujazonejujep.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082252267111---rugidivefufepikumuworoji.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609843bad4e4c---68947899372.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210811_18C3486413AB2850.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/260bb2b822dc2df5d8aa1be475e464a8/73174355777.pdfIn PDF document text
    • https://serka.com/serka/upload/files/poxisozomavixo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/89684534685b85dd1acf677fc3d07f2e/bajimudasanafalukaguwu.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/firokutasir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kingdom+animalia+questions+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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 10980 bytes
SHA-256: d6f15b3520a3ab661f9cece5df08e0bdaf91875d149bdc7caf3daa72661a93ad
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 17148 bytes
SHA-256: f966dfe79e9e5c1b18d1f3a75ae40e2de07c6f939ef873615b8d2eb03219fd74
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1