Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa4651837e0efc8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 23:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52be96b3b06905f7ec6d774c62291130 SHA-1: efb6954c7bea52b3b6b1841a96694e6e1b51a7ca SHA-256: efa4651837e0efc85b72e6315716187cbe04a3892f852afd883b9e910e9ce4e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=chemistry+lab+manual+class+9+cbse+pdf PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/85a53f7c4126abfc70456c010febd6d7/53472410659.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fupolusemob.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/579d26b37819bbf843282743f17a5b6b/bijutorogawapafad.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/55454514208.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/48514429470.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/ropakisofolaxanozexadoke.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ditototamevopozew.pdfIn PDF document text
    • http://allier-genealogie.org/File:/28025944283.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34322251538.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/zipirasupuramibejolimuveg.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c223c01981---64964425250.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee10bc91f---bimala.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/95334409189.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/jewenevixaxoropivo.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/winawenujapu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883dfac256f---43319221603.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6256383ab9---31868501724.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6gbe555o8vkl2b385t170eqvnt/zozetatajinabaketuno.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/22810047367.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/gogowowunukakizowufodeje.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4b88c8cb---64764725777.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/eo3s4148jt0inv7gkpi97sctp6/41626313560.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/03815614c6d9c5c2677a93d33f9db648/49677407251.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/94456655614.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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 11316 bytes
SHA-256: e713b574fb8d386ce48e2785e0afb78e4aaeb7448d78e785494020ab7199c173
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 18264 bytes
SHA-256: 56ee00ce8d34d605662f834c5f8845a5543acae3c60860db85fed3ef3837c3c5

Open this report in the interactive analyzer, or submit your own file for analysis.