Malicious PDF — malware analysis report

Static analysis result for SHA-256 45331ffd84456ef9…

MALICIOUS

PDF

186.9 KB Created: 2021-07-14 06:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fb13b5dd914bb3080f860bab10d425f SHA-1: b533e4b85923d212b10f4a16a6963780a8d7c0dd SHA-256: 45331ffd84456ef978e88dc2dbf484544c5e15d2b9bbdc43c778d511e2896ea9
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of urgency lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0388d8abb---21935144370.pdf In PDF document text
    • https://noddy.nu/images/file/mebam.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/muvudijag.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/53027184097.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/bosoko.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db26eae3b---salenopekeloturimaxepan.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b5fdf8210fc2a4a192c10a83637ba45/pazofixap.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/somipifupotewa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160826df60c028---zubilolizalosufovabedi.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/bafisisomanaguxofome.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19dec4478c---75386894575.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xuwawunazavakepufomafisit.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8bc50c82---bitewijowuxumom.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14830fec9---54187610275.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/436e009c6b2c01d074fd7157f805acae/94643325176.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d13af42b---53388232196.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/91120791737.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9mt5ftjnt8v0cfv3rkn0j7q5ad/ritaromonosepepanafu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e0c3cb34cfff60149bc2a5fc72a38402/94640855819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=title+19+code+of+federal+regulationsPDF 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_off00027d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00029574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29574 10932 bytes
SHA-256: 79ee68ddb4a4df67f231c2933ff6b8bcc1740a3191af94a0289a359e54115d6b
font_02_sfnt_off0002aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AEC6 17276 bytes
SHA-256: 0d9595566aefebcb547a412dc72995e4abe30ecb812a9f1212601dd198032630

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