Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100b3886d6649f3…

MALICIOUS

PDF

75.7 KB Created: 2021-06-16 03:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1130119ddee96a67308cf6742252b50e SHA-1: 6c7e42d7300db3e9c9f9d650fcfc19b49ec4d505 SHA-256: 0100b3886d6649f3312fed95ef94141e2f86c10161a11268dc519f3e7d33a773
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are changes to payment instructions, a common tactic in business email compromise attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://inwebjor.ru/uplcv?utm_term=employment+letter+request+sample
    • https://steklo-shik.ru/userfiles/file/ganurafif.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f7c11147---bafewoxuw.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160928649cc262---losufusijiwomezapo.pdf
    • https://gachbinhduong.com/upload/file/zoxenavusedalisi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/57137c049149ab93d28c50395f6a82eb/mepabonojawafafomomum.pdf
    • http://marinapogon.pl/upload/file/51590487017.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f60f05482---14954609068.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nm2d6j8s16cv5sgiut0aa7rflr/sudutovoxezevuk.pdf
    • http://stalmost.pl/userfiles/file/72901164904.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/a0e2433da7237ff3fce819f1c5668ddc/gotivaloruvorukifez.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/40371968165.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5bc696113f5c3d5a4baed606ebe2f171/kewaf.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082443e343df---16707602196.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/vad2qmitgavjfh797734flfqba/gagamaxunegew.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9db3ee64de64d196265da31a6fe0757f/gugononaxored.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/53bf00892973ede2f03d311f86805e01/gozanetu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09fe7a589cc8e3532b14ed5f9bc557e5/bedegoro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea86.bin
9773d0f0b63cfc232a4ae8b0f10b518379984c18c6fca68ff0d3616176b4a73b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 5152 bytes
font_01_sfnt_off0000fbff.bin
fc712ad82af7684b49ef7a62760dab425e0a1983ceb319f134448dee1c30d588
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10964 bytes