Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d727dea4424d286…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 16:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 595a4a30628b7ecd35777f5078301cf1 SHA-1: f9ad7e99d81554cd9eb6fae44d65fa2842ce6ac6 SHA-256: 8d727dea4424d2869cb428dd35ccc560ada3e68b7d35da0a48f82d408c9796a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution campaign. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=cinghiz+aitmatov+pdf PDF link annotation
    • http://phanphoiongnhuahoasen.vn/upload/files/26934508757.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/xuwodezoralobafugoto.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88159701328.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c80d74d7a---5750907615.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e943027b1cb3d261e3ccb213a97493b7/poxoligo.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/duvigimedixubinejinofi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0223bbe16---63239931745.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/nti23h7s82bfcebf538onatjrj/geregedaved.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33af3b0687---71281758142.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/49052980128.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6932ab3798---vidosanixofumiwelote.pdfIn PDF document text
    • http://lblussana.it/images/file/14528793677.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7c4dc1d121e672e47b9126b8f0b0b23/40451855023.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/57411602239.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9493321174.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c745a310---lojugewuxumiw.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/94beddadfd8478175496543cdff8ef78/32034411858.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce88bbb440---tizeziz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc1ea86ce---16572727003.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210814_562242236770BFD4.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6mr2n8p7bqkidmcahdlkskr076/pafumuxuvizukiz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161001e4fabae1---59630445286.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cf0c5fbf6397accefa8955049b63cc7d/betosazalolovaxalowar.pdfIn PDF document text
    • http://rld-carbon.ru/file/kamabinifu.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/xiloxevarosuf.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_off0000b471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 18600 bytes
SHA-256: 69b3fa15943f79e352a087e525714c3f8816c313308ea979d06ff7fe79093075
font_01_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10656 bytes
SHA-256: 1c60c23321bb22877f65f1d51cee9c7c4ba7035cfe6cfad35a34ca9758e5aef3

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