Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8db51b36863002…

MALICIOUS

PDF

92.6 KB Created: 2021-08-02 15:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e065cf942c0dd3f078efddae4631f4b7 SHA-1: 4269aa0124a8858a88f29fc63e8c2da48c1e709a SHA-256: 9b8db51b36863002ca3829cfd6980cedb848e262fd559d45e72229b4184f394d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/88583234589.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a876c88a5---49221743483.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddba5d770f---21790071461.pdf
    • https://bd-sokolovska.eu/userfiles/file/14017885746.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a248e50b1---tozepilebukiwetivo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mfvqc0121hgri8v0ah2o5vktpq/89106384875.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97e937d9d---fifotupafoxokofumijipuwe.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160aea66103bf4---67708137096.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/44297603666.pdf
    • http://alnoorcity.com/userfiles/file/84365192699.pdf
    • http://groupkaishan.com/d/files/sesekelamowoliwen.pdf
    • http://fandimnarodaku.cz/upload/file/palozosapetogosevokobisaj.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805bec11420---20418139068.pdf
    • http://holzbau-napetschnig.at/lofarelirexugulafulu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d697a9403---vekuzobexozite.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161062d0e3151d---32717569163.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7c1363f9---96362660617.pdf
    • https://pecsikult.hu/files/file/paviki.pdf
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/08560cf1980fa1a5f0d0af13eb8c0b54/42709940595.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8535809e26---32533528219.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e3ko6tg5akhp1sbrlf0cup0a2e/rupagixunukaveraka.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca72fe5565---20139489040.pdf
    • http://robalton.es/Albums/images/file///4298054121.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/562ed9f35355421c72324bd01a071dbf/93932236657.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091de153c4a9---69317987029.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sportcraft+treadmill+tx+5.0+rc+error+code+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ed.bin
cdfc171f2006ab52d38bdb481a5af89acac94611931352e425800b727f03e844
pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11180 bytes
font_01_sfnt_off00012120.bin
3b5173dbbd72ae429ece48252b4aa86aa2d9c52d93ab52830f81787669d720d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 16624 bytes
font_02_sfnt_off00014c70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 16792 bytes