Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63555c7a72a89cd…

MALICIOUS

PDF

93.5 KB Created: 2021-07-19 16:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f389eae70dd58b01aa9b55f7c8a76983 SHA-1: 51c5aa066383738b345ebd208599d022aa8518cb SHA-256: f63555c7a72a89cdbf389d2971d003eb30ee6772cfac5ea3cc4878fd29aa4da2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also includes numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or downloader trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://damsindia.org/admin/uploads/file/62469503354.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b145706eb4---dupinitedalojazuw.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/rezulimagolamubudoku.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0a9d3de842effbd312325746a1679b04/49646097456.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/ttolhv1qjfhg0gfgre01f562c7/79205191273.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/rolabibajixutijazivoselop.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/39655349766.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5a1aac74fef44b73b34968db7770f6f9/44006568040.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/73096275813.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dmbs628mbmgllt08e5urt7ei50/gajelavewoma.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9k7submgop62paum81t2rivb76/14526074034.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/578399336.pdfIn PDF document text
    • http://jsdarvin.com/files/48536805070.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/77721330598.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/nesubesiwururop.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/ladukofomip.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270427411738.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8e40b1a60b1bacd8f9d14c33ea7576ee/59245894519.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d60cmf245u9h88bfmt7fru8jg8/30335299575.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/jitunetokojex.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/47863671820.pdfIn PDF document text
    • http://dnepropress.net/files/file/mubelotusaziguvub.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/momevukazakemi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/056a7263e84fcb25095c6650ada06741/delal.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/zojukobivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+beat+five+nights+at+freddy%27s+sister+locationPDF 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_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16740 bytes
SHA-256: dd201f8b92e691deeb8a725b97345004d3d2ffedb88f6f82a3c1f9cfe43903b0
font_02_sfnt_off00014e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E66 11188 bytes
SHA-256: da5a278e1e203d9e05125ab3486bfa16d710fe62542f954d9c446de332ddad16