Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fe667fea9011a7…

MALICIOUS

PDF

91.5 KB Created: 2021-09-13 03:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b30fbb770af9e4434b1c6600b4d28163 SHA-1: c5b91d8ddc70a2d12e17d001c4ab81750fd8d587 SHA-256: 44fe667fea9011a7536514260a615491eb4f5af42dbdb19b73c307456a51c812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=the+vampire+diaries+the+salvation+unseen+pdf PDF link annotation
    • http://goldartline.ua/userfiles/file/59978513902.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/11765422371.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/66097506229.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/zelefidetuwijanonit.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/gabafow.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/jigajuvijezobezofeda.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/12930187001.pdfIn PDF document text
    • http://skomi.ru/img/files/file/32966333770.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/61015354616.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613621a9b835d---sipewebuxagiragazojogobeg.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wonubofujararima.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7505194c2---52986095040.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/59587863878.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/76986134900.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/musakulunusabajowamubukow.pdfIn PDF document text
    • https://megashina24.ru/files/files/tuwinid.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905100824.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/97984868199.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/98597640529.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/zukirupopel.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mipadosemem.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/45glel2nv4gajfhnn9dfma88qp/71838357364.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137551f79646---6450787231.pdfIn PDF document text
    • 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_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 10892 bytes
SHA-256: 63deb87e02c01bd24c5e6e26b5a3430a3fdea1fe3c0db1f7efd92dd09047cf09
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 17808 bytes
SHA-256: 8a56f6d8d21f8fb66c8d4e85d8bc86f20ef3633782bfd08bd00f8e457ddc1fd1