Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5398fecc863f57…

MALICIOUS

PDF

83.5 KB Created: 2021-07-02 20:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e946e45b6009d69d1cff6147f84faea0 SHA-1: 35ce25d19934579f24d4cd29c146aaec0e6af05a SHA-256: dd5398fecc863f576d5d4a193bd9bf39581b38bf33e9fbc364e5dd0c7842038a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b52966ac---nexezowuburuxowe.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0fc719c20dceb455eb8268020d9ef0e9/mejivaji.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec2ce63dd---57377102389.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7c8148c5---barudaza.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6701e1cc80---41421755480.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2535c00cd17747639c22381912732d47/29067765644.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2895fc0d78---filedomedoromakaxojiwe.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c38faa72a---48885819680.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/75432753823.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d067e2e82416b716d434ad96fe6b1d5c/bepomi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5e7b4125---zosepiga.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/rukarunosibaxutixedomifap.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f9b9937d5e4ed27f84f41a53903c7146/98396494293.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/26936334676.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609410583cdfd---xadus.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/70490438892.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/guls9h4ob8321f2mnu2jtsmvng/lidadovufoj.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/76568778686.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764f753e023---pewiwixosofupa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9f556012bd386000185261d33571ae1e/zirimaxitevetudexirur.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/jegikazopamineposevuv.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/59443381716.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/4015841245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tom+and+jerry+the+fast+and+the+furry+full+movie+in+tamil+downloadPDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 17060 bytes
SHA-256: 591644881891180937f6e6a35e885f2f39aa52b5ed08b21f10f0e86a5c698870
font_01_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 11076 bytes
SHA-256: 4899e3c040c363dfc7924ac06befcc2dec2455c6ae665d1f6145e26aa65d2319

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