Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9f8acb612f8448…

MALICIOUS

PDF

78.3 KB Created: 2021-07-15 17:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 14349f04b19e82b76724ba0c80c2e8da SHA-1: 9c98dbab7dedce9a562ed8279dc27d5c8b19de60 SHA-256: ca9f8acb612f8448a66e10e2d38a5bbc03ad5620d830257d67b43ea94f884f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=personification+in+swahili PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85317235737853423fc81f356a5729e3/5129103176.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c930705fa5c---judurivamisarese.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/9199007208.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160900e9995a34---zijazuzegefotofesovofab.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/52337796930.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/31b5f0b01ffd4ff9770e742a2172bbb4/zamibejiru.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gelesovikivuroboniwesebe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97dacd584---25940544599.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0c869e73---15005310141.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/galuko.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210714040436_d10xcv.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fb9d234773fb8ab88e0e667623ddb075/ratukezizibumifu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jiruwezofu.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/tanizuresewe.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/17913207407.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5605t09b0jhido2sjuk7isrjo1/68035455165.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb120c11dd---sobipanubi.pdfIn PDF document text
    • https://carlojans.com/cms/file/28096918840.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a53f403---71710958585.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/eemsaik8a7jefbjsb7s7a5p1h5/40246424198.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_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 10520 bytes
SHA-256: a772d7aab78ce6d15a93d3141b3488f1af5df6b17f2863c04f1a9b31bebff55b
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 18068 bytes
SHA-256: 9a76bb274d69a1baf7aac7676186b4074ef4d276d02b47222801d9ac198eed02
font_02_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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