Malicious PDF — malware analysis report

Static analysis result for SHA-256 d568d0ac33bd683c…

MALICIOUS

PDF

108.8 KB Created: 2021-08-08 10:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42957a8037b9a94a088671f7e418a4a4 SHA-1: 098424f013d165c4a280ef5a918447ff6653eae9 SHA-256: d568d0ac33bd683c5d8b0b45b3e1397c34a8a33508abf35e6b6c46703a04bdf1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6acb88191582c27bfcc0b855df9b4f69/63162450477.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/xapomarujaleka.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f0580071---nopinapefoxot.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/69420839085.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pevuzabutifevubuno.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xilifubugodo.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210511071023.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbad8be606e---95680807493.pdfIn PDF document text
    • https://noddy.nu/images/file/7999297180.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiforusigebegipifimiwaze.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/7e158c3d4ef3233f1cfd14b475a68f9e/97653145031.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/divivimopejuwovujofone.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7b520336---47693195760.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3501570aef6439653cd4a6f553d10393/titegotiroditavofezapi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39edacdb9---86725084943.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b571b7cf264e6b2e1e9ab7fe6ab52dde/foxev.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f20cdde2dd1---tadumibujajugelowazox.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lt0k70phg1lj3ah4ibhh69kkj7/24245769182.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246a55f56a---35785960934.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cd37270535bce5178b4d0bf0f736e8cf/tavegirakanew.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/33794857793.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d708e6c63c---gomonikaxakegetowitadage.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/45274889757.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074089b75119---xagarusomut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=data+science+from+scratch+pdf+githubPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 11264 bytes
SHA-256: 161f22a4dff1633d6f0fcafd07e5f23f8968df3123b30da4899bb9a542a320e6
font_01_sfnt_off00014548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14548 18960 bytes
SHA-256: 7bf5d7753a59fee2489f4549f3d04bc7fd60e0d27a4c54ea8efe1372a38a869a
font_02_sfnt_off0001765a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E6B 16444 bytes
SHA-256: 28e7f46dc48ffd863e2113cd0f6300f7f9343babd32fd4ebe395fdbb46b02aca