Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897f24c79e73ba5…

MALICIOUS

PDF

86.4 KB Created: 2021-07-30 06:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebcc93617b63ad445c18ed19233a021a SHA-1: c70aeb728a765e950562f8fa59364a8d94940f0a SHA-256: 6897f24c79e73ba5550c3c5369a7ec1a4a8873b98c62b99f88afde7546904a5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=how+to+factory+reset+iphone+6+without+passcode+or+computer PDF link annotation
    • http://ajivikafinance.com/userfiles/file/gakokodolinol.pdfIn PDF document text
    • http://patroha.hu/file/47054182001.pdfIn PDF document text
    • https://noddy.nu/images/file/33976029422.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1ad44aa8---82604258165.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xekuwegaralunerem.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d13ecf2cd---tokumejixusukokoxoremibu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d79c0f51---pozavoralezegemokupos.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f4262cad96c0d1d0f29e3fe4b34e990b/55665934779.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9899d8427---68956160399.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41592ede9---rirosedodizuwuvexereketa.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/leminetununaxibotuj.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/46874463464.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bc07135a1c42202be2a79c0b359312ae/wofedexebamuzozezogis.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/69425902295.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/getoxo.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/90505725973.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160707b9bd6d00---59956902103.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wilebevinowaloruzanezet.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/72846664263.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/komul.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/juzapeva.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/38932737831.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/kejutanul.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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 16560 bytes
SHA-256: 3b0ac564fe9f5fe53ee6253c39c16f86c762a24d5028bbcc4f2ffcc41bf97dca
font_02_sfnt_off000130ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AE 11296 bytes
SHA-256: 1444050bd24b345bfd017b8ba8c87d4f45870867d034e1d62221480242f33041

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