Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1599e869eda0a1f…

MALICIOUS

PDF

86.2 KB Created: 2021-07-17 01:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c77333cc3480c20afdad7c13257a5e15 SHA-1: c76b0618dbd0e6008987688f4208643c467fc74a SHA-256: f1599e869eda0a1f478deedd62fd457224191dee685c647aa7d3639b5d68c90a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The primary function appears to be directing users to potentially harmful external content, consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://digireg.pl/upload/99992266188.pdf In PDF document text
    • https://esprimagroup.com/userfiles/file/rujewozemamejinotuzo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/32200066005.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/rafebewisaduduwabus.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/sezesomufudamolawuxubi.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/83097065414.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dc8c0b80---lexigibuxamanakatabupepim.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vamat.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/getojevileg.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zaferizerukigibutoj.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1598498c15f196b51ed46a8546026e91/15011569812.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d593072a74b0a18e218cdb1250737209/63396701346.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/palv0makv83bootgunkalnfegr/kawodorexebenevani.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/lunukizejurobo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b92cac106a0---duwub.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905516bd50c---fezewonubilanerekokodot.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/89884904355.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/78128476517.pdfIn PDF document text
    • http://metallpress.ru/files/sitifetutuvam.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/veloxoku.pdfIn PDF document text
    • https://network-italia.com/file/66277269567.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094adc5a5b07---wupobakugo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/amgm48s44g8b9ehj8ocdsdn4hb/42896786134.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cf692045a953f689cc8198734accf8d3/24099819486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=streaming+downfalls+highPDF 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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 10964 bytes
SHA-256: 42a54a627a4c8454f48e938933db0c5086dda96bf2fd3375f243504db309e974
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 17980 bytes
SHA-256: d182feef5cd3b893e3e156e7308d3e62c086ed9bf7527432b537b514b3e0e2f7

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