Malicious PDF — malware analysis report

Static analysis result for SHA-256 253a157737d514da…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 05:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3a1c407cc4578532e44c60cdbec3944b SHA-1: f4e18993486a32b2f8bd203985f780077570b627 SHA-256: 253a157737d514da41b7151c861500e5c69207bc60b6c7586ca71573ce2fe850
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0759e712230edd28dc78b08b279df2ad/86269510685.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607437d27cc3e---22939588181.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833e144ed---7912523078.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbef812bb3---zikapefewo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506221634673453.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kazegavatukopowemumefokav.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/iads1rh6gttpl1kkqdmfvfmnlt/90795786725.pdfIn PDF document text
    • http://iwishop.hu/file/vipuzekotinute.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6405e8d623a8b9325a53cdb942dc79d1/40390451439.pdfIn PDF document text
    • http://abnicum.com/files/file/fevogoviwaguvudufivige.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608261b30164d---kupizebusuwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14eb0ed310---xazag.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160afb9b903aab---nizakabidezatoweve.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2ffefbec979e4c7fdb42c2ae6de7d541/84007432532.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54314319---migurotanef.pdfIn PDF document text
    • https://mnlex.it/file/42042679908.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eat8l44tfcc5ljjchbh215tuc1/45924034564.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3s3bdn08v2nheopsmg4fnle42p/9001091190.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/mudiloxuxetozonukebugewo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/mojofimopawukanum.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8bbe3afebda5102e341cee125d6f4600/7597531029.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/26192141818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=political+parties+and+democracy+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_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 17184 bytes
SHA-256: 7f4b9f69797d43c6aa1bd6cf3abf8dde734fa3b5ff70d480192e338a9e4e9cba
font_01_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 10896 bytes
SHA-256: 1c620bcdecf48676e48c9da71c5c69cf1b3bb037bd4ba1c11658d3a0dec6c84f
font_02_sfnt_off00013dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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