Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e8e97b359ee5ef…

MALICIOUS

PDF

84.3 KB Created: 2021-07-17 20:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4c156d53f01110516ce385074703020e SHA-1: 00307c99f9c7cbc13d71d53f996681e441485b3c SHA-256: b9e8e97b359ee5ef821706e2fd4f8912e808c95db3bcdd0be23e3420eb37fafb
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a payment redirection lure and a link farm pointing to compromised CMS uploads. The ML classifier also assigned a high probability of maliciousness. While no scripts were extracted, the document's structure and embedded URLs suggest it is designed to trick users into visiting malicious sites, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://pytextiles.com/userfiles/file/golaximev.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae8f56c31---56390526049.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ba79d15df---35234625665.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/namefoti.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3e240212f0755734cdceed3855496a58/zibifadofukeri.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/42542648583.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8f9176faf1a0918e4568be0a2b530a3a/93302931773.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/ludajuvi.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vogixegidunexep.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/serekijuzapajatalevuvidev.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a2b8d7d0---tumejezodipirigenupuvagu.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/povatodozetabegidumulonok.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/28347596521.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3abb765ab93dc50ef3a2b134f300c801/guxafaxenoliloves.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tqggkktb9h27pbjk5l3cb2po66/xuxixetim.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/32936953948.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/56142001633.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/18240525966.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/zumajibirututajofamape.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde5628eb5---64490134325.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9c5jb1f8lbn05fj4nrh5k1v4em/pemep.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/79538111648.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/86233626749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=honolulu+state+id+appointmentPDF 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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 16844 bytes
SHA-256: 4ed6b21831891779645b9733eb61bcc0db67069a540219a7f01ba9be0ae4de93
font_01_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 10544 bytes
SHA-256: 08fd1e6a7b9c9b4101c173b67a2ce59bf5234dab794f7be17f5c9e379e5b75cf