Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c58ddcf1a8f719b…

MALICIOUS

PDF

88.5 KB Created: 2021-08-04 12:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9fab427efa8f81b0802e80a31588a01 SHA-1: 65557dee5c081e17fa39fef765cc1c3e087e1a85 SHA-256: 5c58ddcf1a8f719bb78cb68349b582b79e39f3db60b18835023c2d673c2e848e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of a URL with 'form+15h+for+pf+withdrawal+online' in its query parameters strongly suggests a phishing attempt to trick users into submitting sensitive information. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yukkumpulgroup1.com/contents//files/dabomawaz.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721636372f0---30948636717.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/mibifumibobolufafe.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/riridawizipilad.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/34959113525.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb433283c---44469263064.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/19b591a721524da2a91fbf9f25ed3c7c/40052463840.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7845c44e0---16333884721.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/33278846138.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1daf2fcb64cda0f2f78776dc9b8b9976/1552879350.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb557215---38143176936.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609130f1a256c---biremopijerepuxakuzib.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e7dd72a1eaf61c81c786b3adaf031adc/xufeziwaguda.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl4p54sbrr7fa28pnvmd11icpq/doradowifapowikasula.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/fusorimevusisalogorasadu.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/depavakamulatikepume.pdfIn PDF document text
    • https://ebooksweb.net/files/file/89310151632.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/raxatukuzujunabomeda.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160869e2367ad0---51252919446.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dd58b66d63ef95a62e2cd9ee80ee34f8/10653245688.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g3nt2diulr5prqo3rs0c4mhfd9/96002946724.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/75390152985.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093facda2cc2---kokilowi.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/detoderositivitisawumu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zoluminemit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=form+15h+for+pf+withdrawal+onlinePDF 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_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16704 bytes
SHA-256: 89d7558a9599306d5f5976d02ee7f53447d0fac687a01e3a7010d37a6b48e51c
font_01_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 10844 bytes
SHA-256: 0aab5468c38e7114f5bcd3bb05bcfbde4bdd10d9a6e165639300e7ef4542e3de
font_02_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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