Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a93feb0bedce795…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 21:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d64307a463f16d76bc0ec6d7452c04a8 SHA-1: 0ab55eacb1a7b1f79c337ce95846eb13fbe095ca SHA-256: 5a93feb0bedce7953430b8f76e3cf4589a07c26233e6370f969bfef5014f087f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links, likely for SEO poisoning or to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/jasutaruzudomebumum.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f06fc2733e795988241ba91d1101b2fd/61435516873.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/51738156562.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/teridasesan.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/gegedekazavapulo.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/57788534575.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rugej.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/dexalavukudunaroza.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2866d4ea0---zaguvavizutikimak.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/93791c9fb37fc22ea60d43893335ff26/kurebu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607734bdb30d1---3916805025.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m8vhtg06p55jbigg647933h9l5/majefidade.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609864314d14b---2580877249.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fuwebakunuvenepalisulesaj.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/96275657963.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec2570e775df08606bd662d8e8e8c7bd/61567330940.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/pazolibej.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0d163d70237d88ca66674ae0fdf82987/fufas.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccee8ef2f6a---74278895850.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/bazupusizigitoboxerel.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/95695820030.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/mv1iqsr6m28gbb398v2no3drq2/99593132487.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e065ed2d8b---85706432172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=college+essay+samples+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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 10592 bytes
SHA-256: 09531100c95e732cda6cb6b6a38b019c8f2f0460c208020c06dd4819a3e6f70e
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16080 bytes
SHA-256: 853e3237b8b99c85856d322131a1d98a5ccdb5d36ea89aff66140f3a16a2d6ea

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