Malicious PDF — malware analysis report

Static analysis result for SHA-256 f001f43fc9b4697b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-28 11:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5838359e0a85aa9db6883dd500f21da8 SHA-1: 7452145021993688307c1b67bf26e6a19deef7ab SHA-256: f001f43fc9b4697bcab632bc443aed3dbb16b1faf36b4be1cd35f4dd04f4c6d5
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://gayaarchi.com/userfiles/file/20210618224700.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/fe749ef43ea3c541a1bed72bc5f1c7a3/19728343330.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b5vv6q8cohq5p97v6kkv09f773/62989635673.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/feguxafifikifexivopas.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b770177d4---zivixos.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/goxemonufotodulo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001866d49f6---sepexobunujowiwe.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/koxeniwip.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/68444601245.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20574833050.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/94ce5e925a547215ab4cc0aa62d77d7f/27372105252.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cmgotn501f2d6kspgtk67d3skd/7566833995.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/79385963228.pdfIn PDF document text
    • http://timebymtm.com/upload/files/32518085247.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/33292684489.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kevopilazodalom.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc257d561c3---45830086447.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/3676163511.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054b746f30---53318702976.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/98278530620.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/28805747563.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/82479651443.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/puvetomuwopuzinofafafuned.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/52998467824.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2884bbf3e5f89f1982ff60440fc4ac1f/83143584504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=logiciel+carte+du+ciel+astrologie+gratuitPDF 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_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 19308 bytes
SHA-256: add408dfdadb10e7998a8a7023145d34661243c32f8e278e76da93adcae8cfdd
font_01_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 10496 bytes
SHA-256: 934850eda384d6bd532e45f7caf1b74b47c3d1a2ee1b1045d8f2b7d9ab781f94
font_02_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00015646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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