Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd13b6ea677bea87…

MALICIOUS

PDF

96.5 KB Created: 2021-09-23 04:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 228975d81488aba56ff6c6a38934eb85 SHA-1: c7c26ceb9c6d0a95a94fdd96462bac676d3de3cc SHA-256: dd13b6ea677bea87c7c17fc101f1d1d316a8806150ab900f207c7e0cd9dd8e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. While no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or phishing content, aligning with spearphishing tactics. The presence of multiple links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0d50322e910e75264b2cc667ab7f58a5/kolidebemubezuva.pdf In PDF document text
    • http://langmypham.com/luutru/files/7385583823.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/29781176289.pdfIn PDF document text
    • https://novitas.ro/files/kapijigev.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/49230723283.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8f3csfbfvp62irfrb6k9clv8f9/48833315780.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/27813678296.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a34296e48f3b5a6fc1661e0d71613dc5/juwusanazajujavefuliz.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/3482171097.pdfIn PDF document text
    • http://chongros.com/userData/board/file/46461995542.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/49143339843.pdfIn PDF document text
    • https://novitas.ro/files/fetakojodupi.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/79109563493.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/lapolugimoboboxulo.pdfIn PDF document text
    • https://il-gusto.com/images/file/rexelukawedixavesaxaxo.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/gelarepajofenusotilebuxe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecc24107b---jofutu.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/didivakezonuzube.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8319809fd---pabimeguxerujibar.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/90748474251.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rufavesofoxi.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/movenakuvipivudoluxudes.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/latisukozerelonig.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/nutogukazefedan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=50+level+deathrunPDF 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_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 17640 bytes
SHA-256: f52d47ed54375a883a1e2159dd1a9992e6995cd26ca2bf9503d25a0dcd415aff
font_01_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 10292 bytes
SHA-256: 3df24960bfecf4bb5b39d2edf909e292c1093b2cd002548b2970f75dc3428e5b
font_02_sfnt_off00015c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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