Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcf11b9cbce7889…

MALICIOUS

PDF

104.1 KB Created: 2021-06-11 12:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 451d8a8fa076e2b5f77c74c5fb4ac037 SHA-1: 9b86700fb8362c8ebebe736d7fe23a8af2f981a1 SHA-256: 3bcf11b9cbce78892ac50b664efe0474a3e835ed69e14bbd37e363cbfa9622f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily corrupted, contains text related to a 'Renaissance timeline worksheet', likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=renaissance+timeline+worksheet PDF link annotation
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wanar.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/49638597930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30a8422a4---79499982683.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3517a75c3---xewotunamezunujewejawumew.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/94794050390.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/86vpe9bcd2rsmejc887ldtf1hb/75463613275.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9110af8e1---87452752753.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3e253de38fb15c98c68e37ecad685a84/39691578614.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/q0c6ac7bb9510pfl6451f3v1ti/zizukuxototuvixa.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021051820094348.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a963162f346---pemomigegijokip.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aac4b8b775c101e15aa1132a515f386e/64471191369.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc6f844d7---81732725123.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/deguwavef.pdfIn PDF document text
    • http://abnicum.com/files/file/sotexikixid.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cbfef36bf140e78b0a70986baad9c132/susenidu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/3835610250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14497 5200 bytes
SHA-256: 7edc146ea5305f710c5c37e5892a635566d4f815bb3852b5ec2822aefc6aba97
font_01_sfnt_off0001562e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562E 12368 bytes
SHA-256: 245affb1c2c995e780437f5e8eacc645279127fc26c60fe98dd18c0a3eaaf058
font_02_sfnt_off00017e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E23 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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