Malicious PDF — malware analysis report

Static analysis result for SHA-256 631279c5c81c4557…

MALICIOUS

PDF

88.5 KB Created: 2021-08-21 03:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b5dd07e714496b3923226638593bad2 SHA-1: e1ebe959da20b21a2982f0d4845caac336533a14 SHA-256: 631279c5c81c45574485dcc152432a1da793cff34c1abe78e127f63cb2b787b6
216 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a payment redirection lure. Multiple embedded URLs point to potentially compromised WordPress sites, suggesting a phishing campaign designed to trick users into believing they are updating payment details. The document body was unreadable, but the heuristics strongly indicate a financial fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ckh138pro7mderkp0nm1u9vgl5/xutonazavudavukedinadoti.pdf In PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/derotodaxolon.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b491da6abfab37d72d9a7eab082fc37c/96642541347.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rapepabanate.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe80d26055---xapegepefo.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/46424413133.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/muzetubo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b09dc0a5---kokikelifiwokeburit.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4699f85af2b952679e3231ade95197af/nunijerasulogekor.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0f32f3aa7---83798420278.pdfIn PDF document text
    • https://fond.ru/userfiles/file/3454716923.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/14041212c80dcc3c08d1f2e2a411ad51/nexuzaximazepukom.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210619_1D72C6A264939705.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd021cbb0---89177614585.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/44583877681.pdfPDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b33d4f4f6---93506168515.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0i2ehpdr5n4c619up0hi772hm6/pulorofurimibiligaxe.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/91801678616.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4bff7cd4618d35e017927caca28208a/34810569441.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6c96f1023---76172161434.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/68605883083.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/60142045852.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/nomazixe.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/zipebewegipaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+get+email+notifications+on+fitbit+inspire+hrPDF 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_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 17420 bytes
SHA-256: 38d2f15a1e0210647d053d9f1a443b5cca272891287a99a639dcf9dc87b35be7
font_01_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 11312 bytes
SHA-256: 0552817df6accdad89abda404ab8c1a3304b802a0ec19ce13d39deab567512d4
font_02_sfnt_off00013a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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