Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b4ac898ba5970c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 04:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1a66da67f5c38a71f1085bf0053dd67 SHA-1: a982f29413e7f7fe47ad23324f230fa44dd79c47 SHA-256: 03b4ac898ba5970c34b5f65f3368b56dd9ec122f6ea4482c3304715ba2c915a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://byecook.com/ckupload/files/fotagojobijomazom.pdf In PDF document text
    • http://markone-tools.com/upload/files/bojugese.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/funuzoxatorak.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/kp32inedjm27setvc8k4u18igj/maronixus.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b6338e80af2---luxijebivewevibod.pdfIn PDF document text
    • http://kfbi.ru/content/file/muzanagutawukuxigu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0042b8f5---52494657430.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e399b5d73d---mexazaxelobipove.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/9357024892.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/1806275348.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c1d440c09a37b3e05dcb359c7aaef32a/numojutubijinokek.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/144786e378c3b1273bbb255b36f4ef22/67163221621.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/87576933417.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/3732106349.pdfIn PDF document text
    • http://pk.mo/userfiles/file/gobabuv.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4f86921302a6dbc171481679300e758b/25011935972.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862d2bbd10e---50414165953.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/lirubozezosojenupuvowor.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7vqtbdev6ccocnfs5j056qq7p3/65258624010.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/dubukojulu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0608c27354---10241912922.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eaa2dbdba4d9fae9e6dc9e592ee50ff1/ladebokid.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/witajadel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stabbing+pain+in+chest+and+back+when+breathingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 11020 bytes
SHA-256: 8138a954b84cc55a35fa801b8225376d2c21648af5fe3ffcafc935dfa9ed6daf
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 17032 bytes
SHA-256: c363d10bd6bd30e9d467a49c0fa05c0b190ca2b8c0c399c236393a53f73a1684
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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