Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b580b918be30a3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 11:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52ee5da09a266b620a395a6059c35ec8 SHA-1: b944c7858617d9f3ee91bcb9d05efeb292891448 SHA-256: 98b580b918be30a30a56e7540d71c60c1cceb501824f236b9c0b6d3fd0b8b21b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous unknown reputation URLs suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ec7d6be1---bobarajiwe.pdf In PDF document text
    • https://marathonlaval.com/userfiles/files/80771567564.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/17438308082.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/nogedetofituterow.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/78816282361.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/betizinaziw.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-13/20210913151808914886.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/buliwaxonilirefalu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/61397573255.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/daxulalatozomivuvin.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/073a6185d73774a6430c5bab62d64a5e/wibariwajofuwu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/mavuwopulom.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/78620227898.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vomoninaboxobaxubibe.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/lovetadirowasokozofeparew.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/91841822743.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/55459204430.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/34243267261.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec0213c1---tegigibegugimixuzopuf.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/83874428051.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210911142414.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/gadefegim.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/giwoseruvopuzadesuditoja.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qonfre7248jtpgu4pe6of3fc31/sojovolagaturuxilasut.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/66560730239.pdfIn PDF document text
    • http://mousike.it/img_ins/files/95918710375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=instagram+takipci+hilesi+apk+downloadPDF 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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 17456 bytes
SHA-256: 7e0ceeca0bdededefd301578ef7c2340c8c07ccf930f4606555ad0d1a4190ab4
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 11092 bytes
SHA-256: a69cb4d5cbfd25e66edded04d41f0a23a34f0ecd25bbdb558a1c104317faeb3b