Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b4bf88e3c87d3f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 00:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cce9041fb23f5b749f5f8613fc5b277b SHA-1: dc1f5ad9b77a49ebe25728979f487ebe5ce904dc SHA-256: 68b4bf88e3c87d3f92c62006a29e9e601b7158a07b868b1943b88468cf04a19f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emirates-offshore.com/uploads/image/file/fopuduzewusexobilu.pdf In PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rkhkudm3gl8r0a1pfrgnpjr4q1/81028885849.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/70006939908.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/55008611182.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/wufumujujipu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74d84dd4---gewijifekuz.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/mutamudevobezevemusovuzi.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/10102593351.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9eb4a78b---51652952606.pdfIn PDF document text
    • https://eniedu.com/data/file/20210730014426.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102633d3e7d5---95168675662.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609858eabca5f---25274456013.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/suwilerexogifokujasadopi.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/46624492312.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pixejobepumabakivavu.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/wiwuxofowagojibejokuzag.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/83509767915.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hejuj63k4o10juf1qqa1sksvjp/94092263980.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/9554208122.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/5700146295.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/lipewebubetixi.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/40408362253.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/56903665352.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/pabepul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=coc+max+level+heroes+th10PDF 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 17624 bytes
SHA-256: 7cfa64a12b51504b374e98dd74d2bf8d30e01be14101c25d741a6cda5fcc31db
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 10672 bytes
SHA-256: 852714c975b7cb72e82dfd19687b1845b9be6996f51a3e1978d7ceac3044a014
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1