Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea81abe4754f2b61…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 14:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db3393a9f9f4861a0bb63915713db3fa SHA-1: 2e2362b2675dd6aded967ccc56a7273ae631e5fd SHA-256: ea81abe4754f2b6187b1f8c6a73b9cc7c360954d58a3909538c5c6651e5b22ef
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The presence of embedded URLs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest an attempt to execute commands or download further payloads, likely through JavaScript embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://chcial.ru/uplcv?utm_term=hotel+tonight+app+for+android PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dab9fc0ca69c2273d7aa2f9fda17b681/xogitukowezogi.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/dofozodubadekekene.pdfIn PDF document text
    • http://na3.it/misc/file/27502348936.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/folupagijobasoxewejute.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/032256271415.pdfIn PDF document text
    • https://htchninc.com/d/files/vifeginomiwarineduxemika.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197222342277.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/64060001612.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fapamivaxibi.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/66994017992.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/15155182535.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/13854328169.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vijabag.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe8aa155a---42156199937.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210915172827.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/da89b44846aac4f5b54ef6aa4c8cda5e/xajujinitonusoj.pdfIn PDF document text
    • http://talleresjpg.es/img/file/15240525190.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/93905040945.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fogokirijobof.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/86999671958.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/43305760411.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/83764604691.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/01a75d1e4850697bb455251e18cef1a0/62889390234.pdfIn macro / runtime command snippet
    • https://marwaautorepair.com/nbloom/fckuploads/file/88423934024.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109060247392859.pdfIn PDF document text
    • http://hnht-electromagnIn macro / runtime command snippet
    • 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 17640 bytes
SHA-256: fafcef774d000f67858a3e064d5580ae065904dd69bc9e75aafd879daa3fed24
font_01_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10600 bytes
SHA-256: d96fd29e57049bc07cba0d2f8d50e6631824b7d578b9c2fd9c8f973e069272c2
font_02_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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