Malicious PDF — malware analysis report

Static analysis result for SHA-256 a094b9669f17d4fa…

MALICIOUS

PDF

96.0 KB Created: 2021-08-03 21:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f7561b761dd9b085c6eabf6b0f01670 SHA-1: df9a0e12ecc7e81da09f6c08acbcfeb667fc6800 SHA-256: a094b9669f17d4fa8df4ff0045e57c78efa04eb14a3b14d739c1dccf5a0d239b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms, combined with the high number of distinct hosts, points to a coordinated effort to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091765b00b49---49218295684.pdf In PDF document text
    • http://nature-revive.org/files/file/fulaserasokolal.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ei28c2aqn18hrn28tjullmerqd/46726187815.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160893d0eb0c6f---71351994147.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ae5953e976e8c453ea88d68ee589b69c/76835912502.pdfIn PDF document text
    • http://espokebar.com/uploads/files/8837621760.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/50376379264.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tofowobodojezerakof.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071986eb1552---dunovaluwufu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/lijukowamaginejutuvapugav.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744638c29fc---vazugiropuvidararuke.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5aa3dd1697156c42d93209cb651fcc63/zisigudufoxepulejofuliju.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pssbgolo3f0089iaf2r37envh2/bugizom.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/40079832962.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/pebagovusufur.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/62417950757.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a9ee4e2a52b6d716eb5784b2c3dce424/84008143514.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b12e72bc40e---33192374719.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fv88kk2olr8kivf3pi04a9u3g2/vusatipetamefiwafewojuso.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/saxefizojosifisade.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8f67fbb57b4861cab417da69ac3ac13b/josepip.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/28967985721.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/59922771654.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798d84b4761---32156554074.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6d094d99---90564001383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=belly+fat+loss+exercise+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 18044 bytes
SHA-256: 081e9d4ce1f3c2eda8724695db0e3fb913f3f04bd1fc724eb1c143daf57abd73
font_01_sfnt_off00013df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF8 10776 bytes
SHA-256: eb986361ca6922f0bc10e702220e4f478a17bee745ecca8f4c0714d52964886d
font_02_sfnt_off00015705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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