Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e3582715de020b…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 09:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3389f567ccad3b621d0db2b8b594117b SHA-1: efd9370f60b5197230536fa21911303bd5fabde5 SHA-256: 85e3582715de020b886fe3dbaca08108a2e3dcc57eddb661fe1abdad4dc3de62
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress upload directories. Multiple URLs were extracted, many hosted on domains associated with compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the heuristics strongly indicate a malicious intent related to external links.

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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608483360a61e---27126184817.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f6802cef58d---xamavagivikuri.pdfIn PDF document text
    • http://keramann.ru/uploads/files/jutalirer.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de155e226---72321511203.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/zetajubame.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/rileredurezotojononesa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/isf6frhi29fbao03t68brvker8/bogelebuvizido.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/63ue64b91qqkbv2k4ngjbgruti/57362657674.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607952ca7fd2c---kovofegerax.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/16070028306.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/8492285950.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/riekeam26rhjmdn9equd8njjfr/12412203047.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/minerev.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/splhm6etp4hgloif4k0h8vv5q1/zolepawonozokujin.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/90816253553.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a6f24f236---vedatifowenolipabi.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/43103978325.pdfIn PDF document text
    • http://sooclose.eu/upload/File/xesukixorekunibikedugobin.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/zusus.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vibusalinuviduratiwu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/menoxakavaputejijufuwow.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/967621437b46e0052baf6ca352771383/biges.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ac152ebb---parewobepagiridofonig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=12+days+of+christmas+a+beerPDF 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_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 10920 bytes
SHA-256: c359394c15b72aaaaa5eeee7a94257cccbf6a3891cacf2fd415f67bab3b36861
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 19164 bytes
SHA-256: ae508a31c334d00548b399f55b1d9ce3231e8b9751e5000d2e993dffc6a87c69

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