Malicious PDF — malware analysis report

Static analysis result for SHA-256 409c24f5b6e6633f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-30 10:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdb40c478051abe25901c3b814c7c350 SHA-1: 6b40e8e2cd817e69be0c9ad202f50b7a17d74a95 SHA-256: 409c24f5b6e6633ff166593fdd3b0e811cf25121a32587a5226efabcd290f935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS upload directories, suggest a phishing or malware distribution campaign. The file's structure and content indicate it is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://philabc.ru/uplcv?utm_term=powerpoint+background+for+praise+and+worship PDF link annotation
    • http://ctkupavna.ru/upload/file/90133962566.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e34dd1f3650c21d5e04f284434ecb258/52994742829.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb05b08ee---vuzobixosow.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lfmu1ncjmt906re941o12rpj7/lelidunetetasega.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/57676629923.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/91348416964.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c07104dd39c---14192009069.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/solideloderolijowawasu.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/dagamasixisazawu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/128lgi9k1027fjak8lf0apkfm1/poligaro.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/516d043112ad4e32c8705ba72655a027/33479588260.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/nanaxigejexosefize.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gamurifiw.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/91976783629.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kewuzifalikowivomun.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1671e667460b679ffad8034455ed3138/82778746820.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/lidisugiwototi.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/kemugix.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9fc445bfd5328959ea8909d64a71638e/pusesiduwok.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fe84faea545e2e0efc20fec6c01d7185/ripinimixuxufixipironuv.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/92099428433.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/49792992332.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/19531890285.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mogatidarezakaliluginen.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_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 17588 bytes
SHA-256: 674196f25e10a1ffd2602770dccb2ef36229fed3894547685adbc04bd30ce6c1
font_02_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 11272 bytes
SHA-256: fb6a9262024de716a42278e953f9a4fbb28d7f8f6742634b23ff7525a2e895d9

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