Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bc60f2e636a4c5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 15:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7579b993d1885b53993da3db8770fa5f SHA-1: adae64e55440127f2f439ac7e58483bd4858eca7 SHA-256: a8bc60f2e636a4c57180d222af2a971eed490c0127a49756b66c1841a6a2af18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to manipulate search results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4a249b7a6877d6bdde6676e0e29d8846/36757864438.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/xizadi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df50e7af80---75035012001.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/36c493708ef7581f4364b547bfd461c4/tuvuwoliveb.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/viweloxutaritu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/pic681ciuaicq3cd8oqjjjmb8u/57688810448.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4395449b7---terumub.pdfIn PDF document text
    • https://incasur.org/temp//files/48938635816.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/pozivamenogov.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786ab7c15f7---ripofedovanizofadimisil.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/38467141556.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/mibetusababikuta.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/60131348457.pdfIn PDF document text
    • http://texmet.pl/userimages/file/koferewojixewojozo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1b97b76b---78598747342.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d1224f347825e9769835a545944823d7/88237268002.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/54130593172.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/8284108889.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumufipodotuluzuzosefutor.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4a6a18805---bafibobutogetiwewatiwisu.pdfIn PDF document text
    • https://emmaushuis.org/pages/38769116101.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d4e48289635f3a50691440a6240bc77b/toxiwiselivawezuwe.pdfIn PDF document text
    • http://minhanh.com/files/vikaweba.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/642057681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=insurance+meaning+and+definition+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_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10968 bytes
SHA-256: d809afb95f2e2cec46358d40d5ce4cd6df6fa1496d127fe4c3df984918a80c4e
font_02_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 15516 bytes
SHA-256: 359d5d735497ba416303003adccc2b09a4c993f759aefb608a02716e9f6c364f

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