Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8532106b771a2e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 08:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1eeb2ee9c0a97cd837de93b1781b9ffb SHA-1: 1fb3fc17c8cdd188bb8eec352d9944e116579629 SHA-256: 1a8532106b771a2ec751e5be34b7b8fc1f6f704a5cb5e0b6104a711207c0ba4e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of these link farms strongly implies a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=multi+a+doll+4 PDF link annotation
    • http://tmacfashion.com/ckfinder/userfiles/files/55762148459.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/41804636535.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/59447268889.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/97714357209.pdfIn PDF document text
    • http://budka39.ru/files/lefaforowafu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7719178828.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35826113489.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/xekazesedogojoruvikanoxo.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/86018373677.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/jatisoweguvu.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wakabubapimutokuzama.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d430e840f8---87065803709.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://weldingportal.it/userfiles/file/45180888450.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bfdd6ab196993ae69a89fdb41c566153/najafeturuxaf.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/dirus.pdfIn PDF document text
    • http://anninh247.info/upload/files/6746470833.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/banusuzavi.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021461832.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210902_FCD08D89926358B0.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/37883931858.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/21962407298.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b962f04d---jojisepuj.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c27bd79e93345d7c08cb4f1653a0d43d/vimipozawap.pdfIn PDF document text
    • 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_off0000b9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 9908 bytes
SHA-256: 5e3cb8836a2d6a6fd4d8d91b2c31717fff788cb511e7b7fabd1227f7e3c42be1
font_02_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 16800 bytes
SHA-256: 506ba28770c1bb4e45a001067fdfb4334d3a561e1fde1d5ac7ea0dde3313f07b

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