Malicious PDF — malware analysis report

Static analysis result for SHA-256 5132a0857a23ec41…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 17:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 241e113d620afb5ceba9a549699253c0 SHA-1: 322de9b342595af0f186bdbfc88783fd0ea15545 SHA-256: 5132a0857a23ec41c3889495799ffe9c4c17dc61385747509cdc2b3efdc615ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a Business Email Compromise (BEC) attack. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates the document's intent to trick users into believing there are changes to payment instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5c49e15fbbbcc72f263a6ef15d5e5578/64432503258.pdf In PDF document text
    • http://biirbeh.mn/images/content/file/22555180607.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/joxupizaj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d175cd2a0---22404418571.pdfIn PDF document text
    • http://dakmet.pl/upload/jubozepokupivepozud.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/13300425875.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/tikubob.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/35bb14556f14fa04e993a51a54d9b525/kexixanavapel.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/35477180046.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sc2ebf2q1v1oh6qeblh5qjoo1o/gatipewoxerabedeborur.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb4cca61c5---tijumimadomegawonuzajo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66581f1804---vodaxedevilix.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb60efb9f---17658041212.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/attuacqje0ap67nui9i1l96633/64992328849.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sg7eh8r7ss1khvquadhevoa66c/daduxuxireja.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1da8375a---90954669886.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/92259089942.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160927346e339e---3427340007.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f6754174---82357833498.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084f19b93468---62208113075.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070c378b2711---nijaropopawugavatenomoxud.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46abe7208---kogewofubudofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=contractual+sick+payPDF 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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10572 bytes
SHA-256: af879e73d702727f70aa46a105113ad8f0100147d40b2e85dcf157714e3032b0
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16544 bytes
SHA-256: 01b14d6ee7a8150ec21182ff15484c6c20106b2d583623eed63405e43b4c9ae0
font_02_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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