Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f530f82911f6cb2…

MALICIOUS

PDF

90.7 KB Created: 2021-10-13 21:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 539f3b1a5fc8981a738bbac659da8f5b SHA-1: 5eb3251771ae19eaf9e212083f35d1ada8348706 SHA-256: 2f530f82911f6cb2542f395f0c3d5f43714b55eeb7dcbf61f96ebcff90ca14ba
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://yeosingol.com/FileData/ckfinder/files/20211013_ED534D25063C9827.pdf In PDF document text
    • https://rosanaalvarracin.com/userfiles/file/firenuketex.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908195859_j8i8tp.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5777ed4a899060e902212a262ea3e7f2/78055237483.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021101547387118.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e41fb71ba1bad8d4e95c60a39e5e084a/83555153782.pdfIn PDF document text
    • https://telorgabus.com/contents/files/95139358567.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/83940727610.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/21568479958.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/36982928313.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/boxafexobofewas.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/raloxijijojolavoxupup.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/nubejiwitukilapobulofewoj.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/nowofajofatatib.pdfIn PDF document text
    • http://kasand.com/userfiles/radajalodi.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/bokewudeletamewamusuz.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/84698012932.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/74410589891.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd288559c2---89604357256.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nefebivisotigazasoxale.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/70994694819.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/17442721615.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/57056572356.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/51547963216.pdfIn PDF document text
    • http://byecook.com/ckupload/files/91540204357.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=medical+billing+related+interview+questions+and+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_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 11076 bytes
SHA-256: fe1b2a39713810da9929c45b775bf5dc777adce5e391c124c7d54f4b559186f2
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 19332 bytes
SHA-256: 1a6967dc0a8c597f432d741ef2741fcf92b754e2cdff7be06dca0d78477a97fd

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