Malicious PDF — malware analysis report

Static analysis result for SHA-256 c730b2ca5a622b33…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f25bbe3238f6a2f9409e2830fa8d80bc SHA-1: efaa49b316031459f05f838fb601208e70ff8f88 SHA-256: c730b2ca5a622b331ce86317b0a31c63ee246b5ac3210d1a53c80616462beffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=samsung+gear+plugin+apk PDF link annotation
    • http://asbufestival.com/uploads/FCK_files/file/11725764630.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908185704-weliwirezilofitosenogasef.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xowipo.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/zovevipupopelutuseveretib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc970a4d2---kuxiwoxofosizun.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noparur.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/gutamoxasusovamopuwid.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/22bf48750c3ddca5091b7f385a17e43b/sudus.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/fukobe.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/lexejugugujagomegora.pdfIn PDF document text
    • http://rs-entp.com/upload/file/bujomuretosaxolovegar.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/gowuze.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/sevototuwuzowinali.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/regoxetasisojatema.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/48039678355.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0c8a24a575638550f5cc75c2988d9eab/vofagipima.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210904_DFD404712450D083.pdfIn PDF document text
    • https://rinducm1.com/contents/files/14430356327.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dc8b6cae---78850093131.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xetomokosivigokozo.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/vujabovatexupixu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8f95cdbd---12778376362.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_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 10644 bytes
SHA-256: 7841bc8e83491b0a7a17792363f186f18be6bbaf977143a2845cc62689e97a4e
font_01_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 20284 bytes
SHA-256: 247070a3162aec5500c6e36c5bceda47ec9e3cec1feb4f3cf840adde0e19f7c9
font_02_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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