Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec194cc2d27575a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 16:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 142a88a8b3f0dbea969addcc4925f0aa SHA-1: 406f64c331e688bf1bf12d9ec6d670610a60e5cf SHA-256: 1ec194cc2d27575a423fa73bf8425c6c54e164876f98b657ef15b9e546242686
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coastalstudio.com/images/main/file/15174864060.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wosogerezegapuduwutusewu.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/zawusiwixonotaxenisewem.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/442c10dd7afc12badbdc4d7c4c3ca8aa/93403485336.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/76560873900.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20141042424.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3233b5f6fc6e93839b0bdccbd18b6945/95969391033.pdfIn PDF document text
    • http://falerisztika.hu/tmp/jeziwezipupobizozedud.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/dabuzazuxuso.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/kudobaxuwi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903ef7a961e---bodoforitado.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10160101862.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2tvj5s4k6le5bqo5o8monodmev/84390216730.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/14702158058.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780fdb4efe8---norelof.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pupux.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/15289378220.pdfIn PDF document text
    • https://melz-feu.ru/upload/kamijumabilememovomokedug.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/12267040263.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b24684330c367b5d2b1dd6bfacbf3d7/fajanelomomerenawox.pdfIn PDF document text
    • https://asi-filter.pl/files/file/puzizorafezidasusepugivij.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/72463503717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=steppenwolf+by+hermann+hesse+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_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 11084 bytes
SHA-256: fe170373af8759006c89f4b30eed9fe406e68ce49bfb808c99422e1bbeee4ecc
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 19332 bytes
SHA-256: 4a25f8046de35f1f95f0a03b2ccfacdcaa337aba3b0d0b5f201332a7cdb3df89

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