Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a3f70055c2912…

MALICIOUS

PDF

90.0 KB Created: 2021-09-01 06:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 292514f63b38e73a3120ceb288598075 SHA-1: a4041c7209efe32c05fb3cd5f09d932549f3aba4 SHA-256: e84a3f70055c2912a176cf575a535289f8f793353334770b167bb06d7a885dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://infrive.ru/uplcv?utm_term=the+boy+in+the+striped+pajamas+pdf+book PDF link annotation
    • https://dadesigning.com/daduserfiles/files/taxitigit.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/52395175618.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c580692ebf56fae6d5619aa0b6b96fb2/sejigug.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca14e1457---24148403709.pdfIn PDF document text
    • http://haai.org/upload/file/36433015749.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/874721626c3ab746a1836c8b11940d41/10247207322.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd0151721---5439177882.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b2f594b93e923f5faad7fcdf947ad833/64453245349.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/95046937417.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/tobapemikif.pdfIn PDF document text
    • http://greenbrier101.com/userimages/63614778137.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dd58f2f2f7e6ad034dd62ebae5347366/vivugijake.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/geforazufus.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/faxofunetegedipuzugor.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/98566813986.pdfIn PDF document text
    • https://icbacademy.com/upload/files/gowegilazofezajojas.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45712b9f1---jototowasirojusepadufawog.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e6e44640f---83081378747.pdfIn PDF document text
    • http://strandedtattoo.net/file/fowoxifomefikeja.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/stoqeioqhrveqcu8376q967k52/wosoda.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e659f204cdd---36949913865.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde0bc349f---6533577481.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/xoxarulajulegiwapunaw.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/df5a46c3e2a4bd0fde11dfbeef008d70/nevakam.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f00a53011dab390cf6b1977f39dee21b/90826045949.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/98928284732.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_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 11156 bytes
SHA-256: 165ec1920dad4bca2d3033848678e09cc029b4d6c8cec0122d056473b0348be4
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 18604 bytes
SHA-256: ac140e63938a0dd206b74f4b7214ec0357745c73f23800cd749b11f690583485
font_02_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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