Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e88a198c87a5687…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 22:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d5eb79ca4f3de2e26b04a9186cad014 SHA-1: bceed784e957e939904338e0e918910dad109217 SHA-256: 4e88a198c87a5687448cbbdb59decf029175eb3e058cbe79639c491107e57b34
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm or redirection strategy. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's purpose is to trick users into believing there are new payment instructions, a common tactic in Business Email Compromise (BEC) attacks. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely leading to a phishing or credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe92d137df---27644909172.pdf In PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/37507833078.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/2369838772.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/sexoxabovukuderam.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/mutaluruwepirinemukexisuw.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/30628629147.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f7c05ec---sulofi.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/pojanogifevozujedavojuti.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/77485328008.pdfIn PDF document text
    • http://agro-partner.com/Image/files/mukefigodixisirepewo.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/74915698088.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/22264279758.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a600df720---xerotofukan.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/tutasogijifidazovoliga.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/sesapupadinuke.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/87359172724.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/97582175218.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/kekun.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137046051919---xavarelawusomekobuwoko.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jozopa.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/12418220306.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/57475387347.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fee10026026518848d7a6cf25a34c096/sesowarudufusosapuruser.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/62912575151.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/60598954960.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/95689418594.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/luritaluzukatobepexigewom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+download+reels+with+music+without+postingPDF 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_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16272 bytes
SHA-256: 2506168a3b20eb2f0f5e3a33ad05373b50b1fac9444e350297e92647c637d58e
font_02_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 11140 bytes
SHA-256: 6a08ffe1d85bd8c21e3eb811a6830a355b59894a4288d9f1686a26a5fb60873f

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