Malicious PDF — malware analysis report

Static analysis result for SHA-256 504de5733c5d1888…

MALICIOUS

PDF

159.6 KB Created: 2021-08-14 11:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de644363cd0b1bfa5557a16dd1cc258c SHA-1: a23f860fd78145117b9aaa8422ccd3cf98bb90fd SHA-256: 504de5733c5d188873233dcbf855024e3029baa26b70a5bf237d8d59e244ef87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. The presence of a link farm pointing to multiple distinct hosts, some of which are compromised CMS uploads, suggests an attempt to distribute malicious files or redirect users to phishing sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://abicecream.ru/ckfinder/userfiles/files/99521706193.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3733b17a---mexipujamulotataxuti.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df034a6f4b---junato.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8cb98ad6e5999738e53ebc0609c6fe42/gebiwetilinomul.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/wawujov.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/39516549123.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609697f315d5c---gufifosijixigusogopu.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/5056728599.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mogezowexaxareku.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/91712922134.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/fegovubekizexanomimubapel.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/99572418123.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/21263007152.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a929c00780b---pofumijepiluzog.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o616pg45hq5mvevt3t4fi7gjh9/zipimu.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/44852977575.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/nomogovabunugavowodokale.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e2f7f5d1---79883271252.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/vuzajubu.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lanazekirudexasuja.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/131cc6d1a09c550726efe39ab0963deb/boxetonajebajubibepazune.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sedijivexixuxobosax.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a06903032---jovew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=prentice+hall+algebra+1+chapter+4+test+answersPDF 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_off000210ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210AE 17356 bytes
SHA-256: efb1c72684210965cb629ac3cc22c6bb6b2a4600a25038ba851cb3a8560afe77
font_01_sfnt_off00023e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25664 10888 bytes
SHA-256: f43326fd403b2d8710cf4dad12bf03992716bb555d68c5f8ec9522620e73110b

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