Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4a57505f0c8a7e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 20:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5890f6a424008b5c2d39005612ecfe07 SHA-1: 8aae8b40dab3c0b0d50c05010ae1a9a455a6900a SHA-256: ab4a57505f0c8a7ef2bafc9a46c20addc7cda759a8f79e16d27b389957c9f805
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress uploads and a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a callback phishing lure further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deeringbayrealestate.com/userfiles/files/toboravosom.pdf In PDF document text
    • https://rougezenekar.hu/files/file/27680339330.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/67447855345.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditesezerasebifupatuvikew.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/galizewiwapumarul.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/703379912.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/40604944661.pdfIn PDF document text
    • http://elma1.ru/!upload/files/fulejovutafolagarumul.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/sokuwisozajajaduwodira.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4b46ecfe60b851835a893dd8ae880f38/wetifikutijuzijatewev.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/44631267220.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/zanipatojebozak.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/lixojuwi.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/14388255849.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/39477900.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/fosozofewewerubogefupawep.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140f37c5936b---rikup.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/82051130389.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/86640179407.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9ab9e8d8b3b6030e3b712d67f244bf9/gixuzevoxisaxevikagupetaw.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/vunebo.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/90745230605.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/21426619048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+update+my+play+store+appPDF 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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 17572 bytes
SHA-256: ee96ff3cb179aea1fd880f07457f711aaf1085c272468b4946d3476843e23e05
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10648 bytes
SHA-256: dc9155c7fa39bea56882960ac0ea53db1620a11d93079c8ddb4a1650c4e5f17c
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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