Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e313c7bb774e18…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 23:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb4558519a4999ed63e234ae214e0865 SHA-1: e926322a5efde1d29baa45139174050801e2acfb SHA-256: a3e313c7bb774e18db24f31c5b4c00a83bca8f67345d430a58574643f9e6aa13
156 Risk Score

Malware Insights

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

This 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 websites, likely to host or distribute further malicious content. The presence of multiple links to compromised CMS upload storage suggests an attempt to leverage these sites for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96650e95c---8908629784.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/birom.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/359b34c3c4fc49f6e30a969c5d1a39f9/88136822750.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/37017430876.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/wotopubipejinisopana.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/33e82b3bd2cfb807b4cac47520170b49/lenapimux.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/23407961669.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/laxinasanazofaroj.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/124ec15a2d29130348fb8ef95f510836/93184865934.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/lopubozo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6fc90161e90202a8e750882dd20c77bd/wabonor.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02b78e5a1f---29881427940.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b3463c5e---fitujira.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/82211934336.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/1qavnpd347vu0ueum3rrl5dt92/63297143749.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a17e34dced---tazovinoketagutab.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/xefaxigasuzuguzegusu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/zivulajajavovokuriwal.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/58004454080.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/50108000453.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/12019777731.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/37385127269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=baseband+receiver+design+for+wireless+mimo+ofdm+communications+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_off0000c894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 17556 bytes
SHA-256: 53ffafde9dac594393146153543fe47d995fb9922c0dba74cf0322f46427dd29
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 11408 bytes
SHA-256: a50839c668d3bff7decea79ff3fdd900ed4170aa19b3b4ef9c609c435c1d5d80
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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