Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7ed98fd9a142c9…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 20:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3ba1d347745e05fb648990c6a9074945 SHA-1: 5b8992aa1c3a72dac38d23eb7e8815665dbc2f8e SHA-256: 9f7ed98fd9a142c9924b8a4645b63a96efc72479b8e023c5aabfd5ccf82c434c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one identified as a compromised WordPress upload, suggesting an attempt to redirect users to malicious content or phishing sites. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.1300

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.fyna.com.au/application/third_party/ckfinder/userfiles/files/vibiwowovunagegulobur.pdf In PDF document text
    • http://capitaldanceacademy.com/userfiles/files/ronaxuzisib.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/34668449455.pdfIn PDF document text
    • http://scpt.it/userfiles/files/30699191864.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/88847059353.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/85513294795.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/okis4egi1uah4o4nudpcnfm3io/besujukebibo.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/88811253368.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/mirafalibesaradi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mm0j4greef0ir0iaamog6s2cep/davozawimujogidukupebi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/38775998376.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/tibab.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/57424969444.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/naturetoxojunulikozivona.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/89690204120.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a370d05e---nopanimolu.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/lunasibimuvomofafujit.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8a40e8c3e2188b6858a4b4214fcd0798/bokezeboxorowanek.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/55292429521.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/wegex.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/57827709627.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/43650287541.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jafobagerulurovapo.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/60765990159.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/worepakorofiraz.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/120806247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+app+for+night+sky+photography+androidPDF link annotation
    • 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_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 10992 bytes
SHA-256: f4427c66bbd717d17b85fb180f523170b8a8a3ef829dde23b7e459c4821fd0dc
font_01_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 18740 bytes
SHA-256: e05f57d888cd02715249e0fcab8f9507ad3be826ef38df292c02e41721f7fd24