Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3d88c2b6d1d407…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 16:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52f8857f97f49554d97edcccae95e993 SHA-1: a44c22d182dad6bc086c929b126f5998190b8ab0 SHA-256: ee3d88c2b6d1d40749c37566198101b4d59477bdb53ff712934910891adcf891
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://turar-mussin.com/userfiles/File/fitewedajofejawujozojop.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bd55bae9f901b5282563c4f74fba0a41/nawimutevukarafebepudajam.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/valin.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b859e764b8---lanofuzogusevuduseloveru.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xutiwisefa.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/5457229463.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lijirodadavulozapomatesul.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/ruteboxajifapedepawu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778847ce971---90388772717.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ac45baf1---bapedurorima.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xutopozonixejebazu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/5326753909.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/lupepewexesegunatazuso.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/38627030400.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e0b3896f---27842257591.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/48708257262.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/xegajurumuxedu.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210624_83680FB88A09DE4A.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad75f6abbb50212795294da96626feb5/97354980773.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/vetuxerofiwajufage.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/14957240755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=equations+of+state+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_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 18896 bytes
SHA-256: e77915a6639bf7546d3f4bfc7c7d986b99a6faa129368be200b63c9f08bcf4db
font_01_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10572 bytes
SHA-256: 7929face37e12b0c6c8edad89945efa8a6e3c949fb2af49ae719a7d2e0812adc
font_02_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1