Malicious PDF — malware analysis report

Static analysis result for SHA-256 25afd2869aed5b0d…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 04:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed59185a364b809587324832ca3df416 SHA-1: 743f1ee19e017cc068511d5865df531b537de249 SHA-256: 25afd2869aed5b0db7b548459868b1d3b39a0eb92660364386cbcd6ee6e7ddff
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites utilizing the Formcraft or Super Forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a9f5a756---78050798586.pdf
    • http://styropapex.pl/userfiles/file/lijakitefivupuk.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/vjrk44t39ic0bi7fifs9d88he0/wasupifibakolosanaxiw.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d5096b2266d9468c24f8cacceae1c946/4550093187.pdf
    • http://amirafouad.com/uploaded_files/file/kenekozalevab.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e33d8ab23---24025070699.pdf
    • http://anaminfo.com/attachfile/file/23304926476.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229922ad7e---52611496233.pdf
    • http://energo-market.ru/sadm_files/dimexedewimemuk.pdf
    • https://hinodanang.com/uploads/image/files/10806823838.pdf
    • http://whewfamily.com/clients/12004/File/14812501115.pdf
    • https://tese.in/ckfinder/userfiles/files/dusigutali.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3564742935---95307727439.pdf
    • http://erfaspot.com/resimler/files/66733208526.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724945ddd77---jezilixixe.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1b76cfc6---48718864142.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160721e8cef885---59988083752.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb697b3885---32374643622.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8afe2ad5dbe29979ce416c3833370e5/82137148115.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac7fe3fc8---79119933624.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cb2940b1be9e63ffb7a9ca3491c5cdc5/tomazidodi.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/baf755833fad2b2b8f76b0156ea57f52/zojefedixemiz.pdf
    • https://activepymes.com/pub/file/vugexijevajox.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/g1f4r2q9hdn31esof2kc0qvla0/fibemake.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c08c1e9ddfd---vevusarepimivoxil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=convert+from+binary+to+bcd
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1d6bd4f73b07bc53757f549e73a96789/goxukisakariz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16792 bytes
font_01_sfnt_off00010dcf.bin
1367e0cc416deae0a6b71bd0fd1c2d5aa3892adba773927e29e64d0a08f4d6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 10772 bytes
font_02_sfnt_off000126b1.bin
96b708280e0f5c57dbe472f517ab5242add88d54e12fbac5eb548c959cf531bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 17776 bytes

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