Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d38c65023d5e6…

MALICIOUS

PDF

88.1 KB Created: 2021-07-24 22:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7060c9497011ff16499406c8ba8698b8 SHA-1: 8f2ccfe012f62861ae12ef89c4a7191863004535 SHA-256: 144d38c65023d5e63a8a67128057d2d9f1a0c58bf5281a9523686758a96fa0d9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e34aae3ba---60089953105.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2a5ed80173d20af9bf1724917965babe/51857366066.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f8f457fbb231c35b53d272f56d0ad312/80383894564.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/xixuxigilulisi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/bijazazukenibamixuj.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/38634427060.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/76552653797.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/27219373534.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/fezalukibota.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce90307976---92741625596.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabe28cf4a---75092180570.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4b79879f---zelewilota.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210623062014.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/39320523064.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/441pp430hbc8dpujiipqpeffm0/44979486972.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/318cb86cd8bd2269697a3542fe3b5585/11693648988.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbdd1420f---52310210648.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af75a3c6bc---kijezopoweguze.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e61ebc44d6cce72770d6a43794549b6/wenivuxas.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3bdf6db2ac454a5a3bddfa1861d5235b/visifis.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a836b321059d8b7f58cf78220d32995a/wojusefizu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e04fd70e4c---zofiwovo.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/71826192947.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ce3bf209---sujazuzikamofetinerazow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+de+sujeto+y+predicado+para+ni%C3%B1os+de+quinto+gradoPDF 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_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 11324 bytes
SHA-256: 0b4659451441baac7519e0b1c8bd0afdd16c6aaa0807cb2f96b48d36b0a99a55
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 18716 bytes
SHA-256: 87eefd7d1281e98edfa7d211d042eda5e1f5b23cc476c0954c225584f16f0bf0

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