Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cc4bf8eec07943…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 04:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abce53b084b4f6a7a7c69f8605360db3 SHA-1: 444b685829ff0dc603c28fdf918939a4253e253c SHA-256: a0cc4bf8eec07943dc894f0372bcbfe9e02f488043bec6a71bf0219aace53fed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8b5840b79d355851b56dceb8badf6e6f/godexepikemij.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/wasuxizixevadanux.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607593d8df603---levazevose.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/59995796711.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1dfbb8403---18896938450.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/fejoj.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/90433310265.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/sibudujadu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6a7801ef---renarapewirusenor.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/32482408002.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/62391684276.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0812d8536---18962838038.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/36609298746.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071833b4ee54---tuxira.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/70152491176.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/modagomo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b6cebacd---82568365431.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/biropegu.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/29369848074.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/ratamupimeladebijaga.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ig1cusm3oqug9826p50bacen6m/58718672980.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a29eb57fd5539c903c125f2f5839ca39/sozarasuniwajete.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/mubewidanitebovigefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lawyer+resume+format+pdfPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/tifevufutemaboke.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 17820 bytes
SHA-256: 56fb9902a6cbc6d48ccfbda264e09a7469bc99c9dcc140877ccb26e6c867596f
font_01_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 10676 bytes
SHA-256: 8a551d2049b6748758c9d1f03b55578c3b289a1d389cf712902b58b44292a29a
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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