Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7001c21d726a1b2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 11:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1bee2874304bb0579b753f5f0fbebde6 SHA-1: 32fb217ed46326b4d2039de7ee42f5dc48616723 SHA-256: c7001c21d726a1b256217d334cbcc458a0534fdf22cdfc087e54f525a3a09fba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, pointing to other PDF files hosted on various domains. Several heuristics indicate this is a link farm on disposable or compromised hosting, and the ML classifier flagged it as malicious. The ClamAV detection further supports its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.smartfutureexpo.com/ckfinder/userfiles/files/saxegibuj.pdf In PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/37800799277.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rm3f6qi87qj0hik4mg8t9lent4/volokozu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a36f52dee58149db16228ac3fc07e0d8/jonuboka.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/nigiwavadavu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/xemuxivaposimesago.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989ead2a2e6---nofavifapokifirore.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62355191885.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/puzitujebakiketa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mubevaja.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/sigejo.pdfIn PDF document text
    • http://tms-operation.com/upload/files/jofizenojazizojiti.pdfIn PDF document text
    • http://atrsara.ir/resource/files/3261047130.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nhnbrpohse7qs02ntg7tr64j45/zoborunuvusebovugasunuke.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/t123v5qrnarmkn4odpkh2ub754/fujeten.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/sivudusax.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611180622687.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/xodatolutidusatoxobe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab059b991---47866729814.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/paruwo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e717a25ee6---guronijazavenoripevu.pdfIn PDF document text
    • http://budka39.ru/files/50973297675.pdfIn PDF document text
    • http://clickvay.com/upload/files/vugulofaweferobatumik.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/75620655302.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/16071377638.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d85b5a05---15074044118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reckless+love+sheet+music+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_off0000c579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 16260 bytes
SHA-256: 7176ad1c77ba20a553f277e2027a8a22176fd555c8a7ec8171cc2dd0fb64a968
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 10824 bytes
SHA-256: 44ba45b049b8df5f2e213421485715b1284962f0f7a3c322e9fd6c9d7287dcf8