Malicious PDF — malware analysis report

Static analysis result for SHA-256 783ac7e9802f2717…

MALICIOUS

PDF

153.7 KB Created: 2021-06-10 10:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 62e732faec07b7ee9b67cb8d030491bf SHA-1: eb29aad235fd312c9eafc7f89019786acfbceb78 SHA-256: 783ac7e9802f2717d52e9a3679009abf6ea7bac762576dca9bf4c2e5bb64aded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to external URLs.

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://archism.ru/uplcv?utm_term=sri+lakshmi+sahasranama+stotram+lyrics+in+telugu+pdf PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ea36db08---55103122772.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d8eed88ddcd789976d4f3555f6a834a3/korirevegu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12c9560c4---fipugobidupovoxifedezoni.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ea44154557b94059fce297a75b12e132/jurupevifegawobej.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160898a235d2d2---10919660219.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/41200598035.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f3cff9866b9113f51fa6a41e4fba90aa/35524913335.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ff3991aa37e3469d59ebe6f78498ff65/10671093358.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aa61cf52042f4059c09616c6c6252ea/73947441432.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d787ac11---xelutuxunixuniga.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020af67a5f---40304691112.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/voviradopunukuvinabuwo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8fc595fccec5e07f96cfcbcd6a94659d/36000847932.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2611afdc3034eda7a46660c84dd26f3b/nagetewinotedavimadiw.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/taminizijegevatulo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160841a672ccd9---xugomejuzematalanil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000164f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F1 5836 bytes
SHA-256: 0fecbee6ede1494b12db05a89f50f07a3bc9aedb4f7ce9c9d652736deb5ff3a6
font_01_sfnt_off000178ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AB 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_02_sfnt_off000183b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B2 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed
font_03_sfnt_off00018e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E69 91396 bytes
SHA-256: 6a178afcfa61a4883e5efbc56d371dcf30436a38e44983039f7148d16fb21891
font_04_sfnt_off00022a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A00 10088 bytes
SHA-256: b9a86f4851ee048e0f554e89250f4f2b4e060c4a733b1e0d39ed776a6580ea6e
font_05_sfnt_off00024c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C17 2960 bytes
SHA-256: fd5a8ae879eb33205c6d4fe88f9351bfd6e423e8e9b5e64836cb142613c369b3

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