Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4d43f9a0e5c7dc…

MALICIOUS

PDF

82.4 KB Created: 2021-10-04 17:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f7eec36d1cc177534ecf4fe5831a51b SHA-1: 9e64d62f1b796b79c83c67f344394ace221bcbd1 SHA-256: ab4d43f9a0e5c7dc3216ea2af4cfeb9f6f44adf0f62647487542a705ec3c0bbf
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=how+to+say+it%27s+ok+in+spanish PDF link annotation
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/79335265015.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/kezuwovilarerazijasoki.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/76114851229.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210929_110836.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/nepuzupe.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xufekidorulitar.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/84689896906.pdfIn PDF document text
    • http://vietlinktour.com/userfiles/file/dujago.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/85347599767.pdfIn PDF document text
    • http://marketingnews.fr/images/file/94444652727.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e89ec9bfdec22b418c1535b818e5c307/54133129030.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/58272781659.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142588f4b29b---41364638439.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161507fefd04af---67577690700.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/48437403436.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/272955720.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/69513381156.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/mexej.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210912_135655.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/58527712866.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/duwuvimaxiriwokofub.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/jofesavufa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a9724e75---62283231293.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/88830067494.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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 10388 bytes
SHA-256: 5141793991c278da52c613d9fca4b80d029377e41221e8174e28d345d7f22a58
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 21380 bytes
SHA-256: 993cb2a923c05bba2118c47234286f5290b9c6645f82ce779d607bdc69c57ab4
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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