Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd27230c86a6f07d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 02:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78df446033b789576dbcd27e00ffb915 SHA-1: 98389cf42a418e43840f05697daabdd17d46af77 SHA-256: bd27230c86a6f07de09e2e37e906ea105c6e7431b0d17fd889c231046009dfab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and using UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=kernel+redmi+note+7+pro PDF link annotation
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/72b63c7a93e7734191e3077fabe16005/13828433121.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/76477731611.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134c41d50076---logezele.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/10448374165.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e781474d6e99cf32cb93bd35ea619536/xexovopazarepural.pdfIn PDF document text
    • http://bitree.ru/ckfinder/userfiles/files/selidilixemavuto.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143914367ac3---mirolifumilujebufewo.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/87443997806.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/44461284725.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/14494812448.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/52009330907.pdfIn PDF document text
    • https://bselink.com/userfiles/file/97482651937.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/rixumesabofojofixegub.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/63146387443.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/82975626636.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/bakuvobagemumefebavuwene.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/bemakebalamafojunujog.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/jikusadapitiz.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/latuziviwusepuratipama.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/mumoxusovegosotewewiseke.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/11973889612.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/59583385387.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/39416819933.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/75512826921.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/sipobem.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314031369609.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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 20896 bytes
SHA-256: 43ea3e6fcbc4c6b6bceba424bdec9b62fe40089f93e9a5d5e3573af287f8ce97
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 10264 bytes
SHA-256: 9a6a69b21ccc38ec6e5e8570648a2b2e10e1d11de3d7b1855e61163de2b0cfe5