Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc524442b33a21f…

MALICIOUS

PDF

83.8 KB Created: 2021-08-07 05:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0395aa24922911c08527673996bf7964 SHA-1: 727f5968d6d2887c9d1a8b7d893a2524f00938eb SHA-256: ebc524442b33a21f193718e17448e192930d27b002d8085d4e50841296f14bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be to lure users to malicious websites through a collection of disguised links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://wastran.ru/uplcv?utm_term=kelvinator+washing+machine+user+manual
    • http://zhouzhuank.com/v15/Upload/file/20217723553034.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0b252cfe7---kuwowon.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f3137781ee39766555fcfb5a4106e7c2/mumube.pdf
    • http://hungthanhauto.com/luutru/files/fijejexobuxazodufududib.pdf
    • http://tincorner.vn/uploads/files/ninamegisufazosukopinumov.pdf
    • http://pandoreunion.com/clients/81456/File/dasole.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eacq9283ab7o1o5i1lr7vnkl1o/wulerisoxirigokisiminekif.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/dojuxil.pdf
    • https://nhachoxebus.com/upload/fck/file/nagowaroma.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jqci43ibtletmct2ht1c5mi2en/31479103937.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ba30bb09b267d0e536fca4c088097d61/6241043870.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/de744ee9fabe782245af68066b09b6e2/90288343202.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5ulkj5m0u3epv6tlrth9f7sdcd/xajefumuruninojetis.pdf
    • http://mdknoodles.co/uploads/files/48538163896.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7c2524ad---18058598593.pdf
    • https://chrmglobal.com/userfiles/file/31565170798.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/758c464c82f350eb55dad0f8c55fa088/25197961011.pdf
    • https://ahreco.com/uploads/news_file/tiwopowabigopume.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e497724184---gobufi.pdf
    • http://ongnuocdenhat.com/upload/files/tewemakexajiwed.pdf
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/50f727db8d2d322190401b9be4d12e4e/81651431344.pdf
    • 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_off0000e2ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16792 bytes
font_01_sfnt_off0000facc.bin
e1a649ff29bcd83b0bb6b0c65cef87e2d1d3e68089d126744baefbdcd93c1bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16844 bytes
font_02_sfnt_off000126d1.bin
c11392a85fd8984c5d29e2104f0d344d546219f8f680a84f2ffa5b0c5998d324
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 10920 bytes