Malicious PDF — malware analysis report

Static analysis result for SHA-256 285c1e4f5bcdbbbe…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 20:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a14e48bc742a39c448a6a912e6092cc SHA-1: 430fcc565e04112dd09ecee97ee40b09c7883a09 SHA-256: 285c1e4f5bcdbbbeff58b1bcd8fcf05e60fa658da37c5127a74f77535e909f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing FormCraft or Super Forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary function appears to be acting as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b40a8f30---wipalorejeferukusuxiraw.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/mizupunudafatoto.pdfIn PDF document text
    • http://ned.ru/uploads/files/nubozafureb.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kemoxorupirufokumulaxofo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/647b60d455c093b976ccc8ef456224f6/fezasikokukamor.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/8v4a2sgt44g67ban1e6cvjmlpf/42882538500.pdfIn PDF document text
    • http://allycatering.com/userfiles/61804861093.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/18290473796.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c894cfad---21844438667.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/94529441409e39dcbc13ac17c9f5a67f/82089111351.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5aaa9b1e---kedofelu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42016005249.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df34104f8fcce19c89b9866fffe3c3d3/dokuzetaxupejelerex.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c99434634e334e010a1bd1f9d5f345a3/66567998823.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b59cce9b---menude.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/59798419631.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/43672856529.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b253dec420---79459812823.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a14657e4---xitetuneda.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ef6ae137---42033513308.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/51110257244.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34c4a1ba---dufagupeni.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6c15bf00---47649619681.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/58418237572.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96326e37ea---9426832603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=meaning+of+incessant+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 11008 bytes
SHA-256: 32a555fd470009b2770a481fd8c38ec7f49184664a93e8099cee11335250a058
font_02_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 19440 bytes
SHA-256: 3101ca66f7c9207833a6a660c196587fef34ce73c9dabed8e455f42fa274333b
font_03_sfnt_off00014aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA2 10508 bytes
SHA-256: a4f388aed0fa28e523fcf1b15280e94c179641a89715354386af47c02fd48778