Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff91682a400c6d4…

MALICIOUS

PDF

79.8 KB Created: 2021-08-04 18:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b77332a62d5392812f5a082714f1bb61 SHA-1: 561323d0abbd3ec3214d6e07eb41d3f947202e4a SHA-256: aff91682a400c6d4236eb1250bebd2280eae27803e7b95b81c9ae762318a3030
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to manipulate search engine rankings or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf121eb21b0---davedex.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/tupefagobi.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5c9d47ec3c04aadcab3ccf5026be9643/72582757061.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3bfad8ec593ad8bcba6a17702bb5c6e0/60894208910.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/siwakuwipejojabisurur.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f749c0283---70859148475.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mhe72puoic0h0jkum1njdth121/97138603765.pdfIn PDF document text
    • http://immopolignano.lu/images/31483005305.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/nazorupamegijilo.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/12917068988.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e527f8be36088a2fce164ed3a16941a2/luwasezuzuxab.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050412003078.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/894rcgm1ofefajvf10amvqhpp0/jodevobixibupa.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823224c19d1---58838443749.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nf0sum3jl9nijfoe71liol4ioa/zeforike.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/refaxitamosig.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd0e6ec7f---66893423540.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29532de8d---guwokavererusonuti.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412b69d64c---valezujofixosof.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c28458ebb---tamixikikamizurobax.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/gigirikebusixar.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/88155951663.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/72611189130.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ef4ecf3b07---13480458116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=research+done+on+accounting+and+finance+in+ethiopia+pdfPDF 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 11000 bytes
SHA-256: 35b601f2cea67e0fcf0eff72a4d35506d9a26e39c0287dfd13a21869b57b4f82
font_02_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 16828 bytes
SHA-256: 65da500afcb76b74751c757d809fbfb5bcc814499da42712218999b441a444cb