Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1adef46ceb36e76…

MALICIOUS

PDF

89.1 KB Created: 2021-07-20 01:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 118e9f087becd08424d370d5fca26f70 SHA-1: 7ee7c1a2bf12c492b262812577a2dba2c2e8ddd2 SHA-256: f1adef46ceb36e76d65d3e94fd47cff19292478252089a2e9cc091e32d8adc44
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable hosting and compromised legitimate sites to host content. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://cgeminfos.ma/upload/file/poximikuzadibojenomes.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b841eded446---87413108900.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d21b91dda18840486c19ae6bafd467ba/36325256395.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5159e2852ec1ad002494598758d30e8e/jisan.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16095bef96df61---sitibejuzidibavala.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28f9c4ad587daf0e64dba4b526c4c6aa/99108119592.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/pivetisifo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/884c094fb69bf5bc83599dddd5de2a43/bipaxaxajitenalafevafe.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a40dd4d1c---zupupabijatofizur.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7152ec83f79112fd6ec519336cf75854/65278934008.pdfIn PDF document text
    • http://accronline.com/userfiles/file/52336523864.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/24119656823.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1ebb3ac88a---vidaterabulus.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942661d9185---rowofosopifunurugelinalom.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bdfa6ee61---fotovafidake.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210617_C47FED36E87B33AF.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0b027ca8eedddff9333072d1d4335f2d/53295094788.pdfIn PDF document text
    • http://amandamaitland.com/images/file/luwenitabuwaninuvisaj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s19dip27urn7f57li6cimbu360/misamavafagazuzovenela.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gsqvd9bllpikkmsah8clpgt3d2/midewugikokazado.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/wewolotibetaxolotepikena.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/29f1d6b804c76e195d8d9c6b4ba9a3c6/jibigeje.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/salebebebusobukuk.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210524051415.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/witevoxokanavuvivizex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=smokie+norful+all+about+youPDF 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_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 17360 bytes
SHA-256: 37c0078046beab608d4b611c8548d498f13fea404cf2bfa30ca134fe28c684a0
font_01_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 10728 bytes
SHA-256: 89986755cc86ec3a9ab90dec557e7232639680bc489a02f849fdefda57330c58

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