Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aa36ef8f47a012…

MALICIOUS

PDF

70.1 KB Created: 2021-09-02 22:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c44c7488c6f364fbb7076c2e00661a9 SHA-1: 57da8fa3355550d8d520c8617ea64dbf5f2dca35 SHA-256: d5aa36ef8f47a012baa4200d4334ee3191ca1c519d78f8f09aa0121958d4aaa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, including those hosted on compromised WordPress installations. The document body is largely unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://bloc-immo.com/images/sarosusoximamitima.pdf In PDF document text
    • https://alpinashop.bg/files/bozedimunoviwozog.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/858b659d65ad67ad5c3f65a86bee6558/tedawer.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/47025494841.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6763f58c88---4091949119.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/30337960455.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/xokagev.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g34tsockeqjq4036rfatba2kg1/66511042833.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/29713337663.pdfIn PDF document text
    • https://migger.dk/userimages/file/86304084308.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/vinasonafudej.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g7rhbr0ednnv50dmgmmvb0tc05/62964565111.pdfIn PDF document text
    • https://retta-bg.com/userfiles/zeraxefovekujoz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6142d911f0---89013663607.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ditototamevopozew.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zigeva.pdfIn PDF document text
    • http://strandedtattoo.net/file/jalaxawazotilekozeronuf.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/69248720595.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4457bdd40---99913413966.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838bc02fc62---zupiwiloneferunilarexen.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/38629918619.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/01eb4607414db7ed35c019ff21975329/fopuwubijunabig.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/75272861773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gastroenteritis+fisterra+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_off0000b595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 14816 bytes
SHA-256: 3573b7dea97797ebbf88bfeb18cdaaeec07fc8e2456639633784b069e011a277
font_01_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 10484 bytes
SHA-256: 99d2997cfd4cbec14f95c5279b4152bf5843664b2b0c11d12dfe8f0c817de78b
font_02_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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