Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cc21a72b851e72…

MALICIOUS

PDF

89.5 KB Created: 2021-07-23 18:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f4713ba7dd16e87d193f6fcedca81ae SHA-1: a69202b03e413e79f666bf3c614f52d4be4a6819 SHA-256: 75cc21a72b851e72ce3e786b978dca29f388cc2a31d6ac4084b52a9d67a5e52e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests this PDF acts as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ikoi-es.club/yamituki-n/uploads/files/99627322318.pdf In PDF document text
    • https://mytopics.it/uploads/file/fogirowakobi.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/lareniguxala.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f33a2122ec---92019738595.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nunonov.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/97830245623.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e279ea23c0---vaduwuvofepufob.pdfIn PDF document text
    • http://imi.vc/upload/files/zuxefesefujamike.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/vegalufavosotup.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608195e2ab1d8---41404643099.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gadipudikifidenijusurerid.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/3797616901.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/2676186663.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/6990679060.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093c31ada0ca---xedepufimupipowam.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ba0354842888d441f6e3e55b0b287e32/fuvided.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/gutisoguzirumuvewov.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/dufisab.pdfIn PDF document text
    • https://bio86.net/fichiers/32147867145.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/14549085626.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca317c8e6---99303095364.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad93a662a---78934592739.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ff45791c---lakizakuti.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a848e3c2928---23041114392.pdfIn PDF document text
    • https://hgb.se/filer/file/80365548137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+put+a+safety+1st+car+seat+back+togetherPDF 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_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 16540 bytes
SHA-256: 8081e90cbe1b9bf21cb143ff46e2a19173425c13fd51f57152b384b68f19046e
font_01_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 11092 bytes
SHA-256: 7f1e42b419c487a84d63396fcb6594fc98b09bc05f264929d24227f0d16f943a
font_02_sfnt_off00013eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1