Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3d869a030e7ef5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 23:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 492e1e4b6a639ead80246dd4160f589d SHA-1: cd4576f281359bb0b99a2c4ac992631f6519d27f SHA-256: 9f3d869a030e7ef5dbce32a8256ea82706e063c5b7d244c4d5b0e3705ddf19ce
156 Risk Score

Malware Insights

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

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 of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=andy+emulator+offline+installer+64+bit PDF link annotation
    • https://reazfarah.com/ckfinder/userfiles/files/48672551532.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/kuxumeli.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc6a9813c---78269269030.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136765530471---kixuduvugupe.pdfIn PDF document text
    • https://beautydent.hu/editor_up/xozedivuwifinelolivej.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/64245197228.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/72438450227.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/17665728667.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210918122245.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/51139351151.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/74187599365.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/79116039960.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/25197143129.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/51343518934.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/897f56fecdd1ed648cf85460981eb588/gadelatunakunoxozes.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161440914c00ff---domakuleluno.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/90813045947.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/19302965021.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/76045806717.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/ruwezajiwe.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/56992134216.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444a5e3bf35---soxisowofejusazofovib.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/zukosabof.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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 11096 bytes
SHA-256: 4199ace58bea67a8ced7ad2547ea42ffc9b9c8cf9a83fe8c144e693e2bc446e1
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 17432 bytes
SHA-256: f7d11e2c747c57e8ffcfee1c66823808f3623037a143f5601667c0d0ed462435

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