Malicious PDF — malware analysis report

Static analysis result for SHA-256 df487f4139222c0b…

MALICIOUS

PDF

100.2 KB Created: 2021-09-07 10:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89b2298fdb3d57a1d1757ad2b1f63fd8 SHA-1: cfb276b96cf21ca3945baf8279be93fb1f177564 SHA-256: df487f4139222c0b8d43afe7aac2d06d054d6793bea9d9e85a2fec9a8830c9c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing campaigns aiming to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://yam-token.com/business_school/uploads/file/24646541540.pdf In PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/dafodixos.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ad91777f---24025304743.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c705da954---fuluxad.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076baca1c8b8---zetorezabobigur.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/15ikk2beoh3rd3po8vpo0u50f1/vakimozaxevowiwerar.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/73501816712.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608517c07041e---xujijujiserofuginizuze.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/91350008461.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/66635076105.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/omemm1jt9ebpgsatdeenk4d0vd/dubitibudoberaziboda.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/logegutoropenumu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/44182855795.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/nizojitaxesivaxiresujuzil.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/15945049551.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hg5o7ee3heilju6rbhmoq3vvab/latuvitusigozow.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lomagi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4d1a07bcdb4e7fea985d4b7d2d05ad61/rixanuxugevuvodugu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/74938226163.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/aqc07akeiughl7v3dc99puhl00/sujadenak.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/79a6024b5f1036c9f27fe8944510018b/59297439239.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1611313246e7a7---gobelepejamakub.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3e7b6746754369824a88ad5ef8da8c85/jurogok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jlpt+n2+vocabulary+list+pdfPDF 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_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 11012 bytes
SHA-256: 84ad8c20e859e3b9057764b62dd23bbf49b492717b266495168847f7c4a10e47
font_02_sfnt_off00014899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14899 23436 bytes
SHA-256: d0f838c9b70b22eef71c98305ab4a9a684f4acb0d13ab12e558140eb5a0402d0

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