Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39fbdbbb11bee4b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 03:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c9192f36386f84022a13057da7b395b SHA-1: 1b8f3aa45b82c20ec14e8c8942fc775e7b47656f SHA-256: a39fbdbbb11bee4bf1735e976c83fa8ba4745007e91621619195a8a397d607f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised CMS uploads. Multiple external URLs are embedded, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://skywaynepal.com/userfiles/file/sozexenakud.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/31711671641.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/wojilavurapexomaleto.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/30417745559.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/dulevetavove.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/39622374068.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/17525678703.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/pupakukirake.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/97204719268.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vakezolokafemotuputa.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/zuxevefodotix.pdfIn PDF document text
    • http://fitviewer.biz/files/file/bozatifegor.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/rujukuxuk.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa06c62a72---39203127542.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zazuzidalumas.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/lajamokuwexasir.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/bonawokatinevu.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/16990984697.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/45555230327.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/wiwamiposadexaxomuje.pdfIn PDF document text
    • http://viorina-deko.com/images/file/zabetapa.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/xajixobe.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/jawokusujabem.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f3ca1ee---92613306742.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5ea9df79aa8b222bbf6dd09ae62ced63/53192769105.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/80968347793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+z+mugen+androidPDF 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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 10628 bytes
SHA-256: b60f11c1694e983ec2ae16f0a51a53e7d5bd1a3d3325b83f18c88351a48d7769
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 17768 bytes
SHA-256: 62e9084574815b4e1a378b46c4acffe44e2087412a8f3e6c156be267f1f5b751
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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