Malicious PDF — malware analysis report

Static analysis result for SHA-256 6988ee53d951d550…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 08:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3db5c6a53a9743c6266b1116fb2bdd2 SHA-1: b63c387933acf50de3b179d18930ea48bc87701b SHA-256: 6988ee53d951d55044b5e65b1e3864cff79e8f092dad5f81e5a29b3393af22cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based distribution strategy. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=battery+pro+apk PDF link annotation
    • https://knoxvilleremembers.com/media/noxixijisoge.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0b5632962b7e48723839ccda4431870e/pawolakalurubuzela.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/dafuworepepujojeza.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef79826c58---89604474968.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/fimoboxiwavizozeken.pdfIn PDF document text
    • https://haidangpc.com/contents/files/muterowibejidi.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/1444264731.pdfIn PDF document text
    • http://holzweiss.at/lavixasepozi.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/11846714876.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/luzorubejivufexa.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/raxosoxebe.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210905060625_369361996.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/padukitexa.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/zigaw.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/48570709225.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wemiwevenojuru.pdfIn PDF document text
    • http://health-bridge.in/upload/file/kagire.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161335de8588b9---nufagadogipapidaxefafurok.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/18380098895.pdfIn PDF document text
    • http://kunbot.com/upload/files/34009370482.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/damezejoverekok.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/96796276313.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/kukatizu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/51187302597.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/75009340582.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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 15332 bytes
SHA-256: 193506262a155562855319715a624a613dd64a4353a8a220bdb9439666a39dfb
font_01_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 10092 bytes
SHA-256: 9d621bf2a4f177d163057035c8597faaa85a1cd01eface67744cda7bcd5d5450

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