Malicious PDF — malware analysis report

Static analysis result for SHA-256 488f1853a5acffe5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 03:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 206e9a25edfbed761b762418fed6c067 SHA-1: 53b034afb4d5338e7e636443f1e4b49bf96443b4 SHA-256: 488f1853a5acffe57f64a45da9bb3a1f3226e5550eee308646dae9030a9e0f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of 'free download' and 'crack' in a URL parameter further indicates a lure for malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://daglichtfilters.nl/ckfinder/userfiles/files/29026590295.pdf In PDF document text
    • http://hmondo.com/userData/board/file/gutowevedixemomugogi.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/nesakanozusinuruji.pdfIn PDF document text
    • https://bdata.vn/upload/files/tivegijubuzavivat.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fb4e5287f2c04df509e1720b2fbb4eb0/65816648259.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/35761156567.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/rorijugesaroredubomobu.pdfIn PDF document text
    • https://anaksemut.com/contents/files/wawamowuroke.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/vidosinapadum.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/92823849888.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/pedufujifos.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/mavovufodasujiteke.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5d2d827e---tanepaxowisuzivotifula.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/52941202865.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/kuviduvotokanumed.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/dibifipamovivuxag.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/76249701260.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/77565238394.pdfIn PDF document text
    • https://olterus.net/contents/files/17118199477.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/48595641020.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zarafemebuzewimuliru.pdfIn PDF document text
    • http://dges.in/userfiles/file/15330536073.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bf74638---mazokazezewaxeduberekos.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/fipidozowepoxosezetowekon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+download+windows+10+32+bit+full+version+with+crackPDF 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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 17212 bytes
SHA-256: f4449135c4597afb0beb507e2616479c70e7f37cc470a70e05a10535d340c9fd
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 11500 bytes
SHA-256: 2def659e509ac0731882efef607bb1c9b0a7eaacec90808680357ced88710225

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