Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5482d65d80115a8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 21:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b387932a5c94815f146c81dbf67b495f SHA-1: f14fa75a9fbc5a7ed92955beb6b6a5bf4bcff953 SHA-256: a5482d65d80115a83ba667459150d5836b18cdcee1c6cd97b1be394cbbe31c41
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gidromall.ru/img/uploads/file/63764988589.pdf In PDF document text
    • http://fcraregistration.com/UploadedData/file/20665297285.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/36340055865.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/14728383309.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dexapegezo.pdfIn PDF document text
    • http://cke.hk/userfiles/61704519450.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/vipubutuzexonofemilijug.pdfIn PDF document text
    • https://jss-moms.si/upload/File/poxifoxo.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/vidibemekudapag.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vj3gq53ph634k7cb0lscjcmqjq/74527757817.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/83864541980.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109011656087248.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/redolopopuvos.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7c682472675972b52a13b70e9a6fdbf2/mijoxelenil.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/devaviboxo.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/69045006666.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/64994271772.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/ziweruzeka.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210905150910_828041423.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccf8c75283---24536300951.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/jegunupefewolaxiwulokepug.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e48553d6ff9435bad2832fff645fe29a/89491099092.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/57606052388.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/melogopuvakasimatumu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/watoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=java+examples+in+a+nutshell+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_off0000b49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 18756 bytes
SHA-256: 886eb89974983eb7f9604679cc994bea11644eeaf7c0a777d993da27e6167a21
font_02_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 10804 bytes
SHA-256: cae5820dbcba627422b71dabe4221090675e47501edd237e0c5a2c5ca9ceac1c

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