Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae477ae0338517e9…

MALICIOUS

PDF

108.5 KB Created: 2021-07-23 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ea805283c3fd9152aeafdbe73259e84 SHA-1: 7ce353bf4b5016af3fb1e34e8d9c599f03a48425 SHA-256: ae477ae0338517e9183805c5c29c9470df441f40347149c4ed759054326bfa48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable domains, forming a link farm. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://alajuusa.eemedia/contents/file/dopika.pdf In PDF document text
    • http://biotledlight.com/userfiles/file///mivituzoxoduweneramude.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d64caae58---nixuxivugud.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081110d5bd97---zuvusomajalevazelo.pdfIn PDF document text
    • http://henca.com/files/details/file/mavififatir.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c237bc16d2---75627725712.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210610030556.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/42858089842.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/zuzibideboditokexopowonix.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/35616505777.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/87974328680.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d4b04a99d468e42e4266b39827e9ac11/fagiwivovuromulimoxu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/67588511340.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a167d51ae0162d019ad31269ba74c4a9/81680669073.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294c7eadf8---gegatataguzeju.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexodan.pdfIn PDF document text
    • https://ghnservizi.com/file/79809437043.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/junidajokovovowebe.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/28579152448.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gtk9qe525nu44iprjult0247rt/32865185279.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873b21d0efb---xepefovibojivovivomo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609979438e5ff---23842142738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ancient+hebrew+torah+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 17952 bytes
SHA-256: b1e83cc359ed704f16cb206ca6d04b0b20274ec42bc19e072d9b98bc59fe3618
font_01_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 10708 bytes
SHA-256: 42af375c0caa45d9325230502c8adf196c0f3a76fd682d334aa389129e272892
font_02_sfnt_off00015971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15971 19744 bytes
SHA-256: 6482f88e3761d71161d78bb0c5d6fdecd1388d943edfbf8e0c2ddeacf14d73c4
font_03_sfnt_off00018c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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