Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc43ca3e3eddeb…

MALICIOUS

PDF

100.2 KB Created: 2021-08-15 22:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a69767f02891d53a52e9f536fabc9bc SHA-1: 65d0dd5eafc6bbd57d487b24ee9199d903dcf18f SHA-256: 39cc43ca3e3eddeb8a89a9ca5809aca5c787da6709bd55afb5daa9c7e1f654ac
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded URLs and the ClamAV detection further support its malicious nature. The document likely aims to redirect users to malicious sites for credential harvesting or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 8

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=how+much+is+a+water+slide+bounce+house PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g8jbt8ic7kf640i8ais7erde0b/tijitinuwikiv.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/lidegejiwekaloruku.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/najide.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/24531723560.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724ec829815---7095869731.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/15954191298.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/17837924177.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d24c56101c37c5f0524d86c1193ae4ac/xowujitulesizadugajedo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58891852e3---74530433473.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4a77d3d6---63410878100.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7bcbc921---dizupuvodamomupidifasijen.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/93238125671.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9297f1f035b94d929bdb3229e7123ab6/89974894444.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/vakozaxipasukigure.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vi4g7uundvb1u8ng1f7bq1vbo6/jodekuvamulidibosixofeg.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fasisururivaxinapolarat.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qu1p9h0c2eukq4opt4csi12or2/6661638255.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a7f325dede8d289074992192c345739c/48114488434.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/14bc0e9b85ecb272cbb69a0d2e6fd977/zezimada.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/wonafonomivomi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/33733607478.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/hq50fd7qegiorafslt9jjq8vdk/36030711390.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/siwubirefemelajagufukuv.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb35ce7e657---koxekimefemarovepivima.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4bc772e39a90349c085a21807fcfed2b/zetax.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/gapidugog.pdfIn PDF document text
    • 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_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 10952 bytes
SHA-256: d6c4a2fb657474ec301ad08f065c924df8c2926a4abcb359a7b9ba13155bfa09
font_02_sfnt_off0001538c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538C 17864 bytes
SHA-256: 55238af674283a99fccb8ec1ed44ed60b67c92595981119d05dbeb1a18464891

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