Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b21d6daee544881…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 18:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f65e38ae28580fc3679c6f6a0a8e4372 SHA-1: 692eff26637d1013a190e912437841ba53eeb049 SHA-256: 3b21d6daee544881390d8328fb2ac7e4e3a7b1fba164719b56b2f4b82bdaf299
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a fake CAPTCHA lure and a password-protected archive lure, designed to deceive users into executing further malicious actions. The presence of numerous embedded URLs, many pointing to compromised CMS upload directories, suggests a phishing or malware distribution scheme. While no scripts were directly extracted, the overall structure and heuristic firings strongly indicate a phishing attack aiming to deliver a payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://reazfarah.com/ckfinder/userfiles/files/duxagobar.pdf In PDF document text
    • http://haokunchem.cn/upload/files/94064894778.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/79378412353.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8ffa23713b75860dc3eff819a0d45000/mejibobijebuwadex.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161456c8b1417a---jojalebiv.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/94289272.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06924c249---tunogegolewekinozila.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/78586841091.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210917_9A2772DA3874F235.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/47291698441.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/82261299388.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/73997916255.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_095440_142.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d1e4dd71b25948f21bb4738d54bee9b2/82010526688.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/44514979866.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/58060599992.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/rizusiwikex.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/56439836014.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7fa3dd6fe92fb959786be631dc7c1aa1/55587320238.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/46207855912.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/11943a3b3bf69f8311dacadd70c38e38/junozaganerepujas.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/84836827723.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/muxopeti.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/1097138541.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/vikodasizejivogokirifawub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=plants+vs+zombies+hack+all+plantsPDF 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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10896 bytes
SHA-256: 78650f4f283ffb6d8ed57631fc6fd4d20ca5a553225a67ad8eb12e401f493c55
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 22780 bytes
SHA-256: f8be25460deddfad416a523b522900a7ca66f7dd202f7a690e164ffb45a61081

Open this report in the interactive analyzer, or submit your own file for analysis.