Malicious PDF — malware analysis report

Static analysis result for SHA-256 a522fe0c96f3bff3…

MALICIOUS

PDF

80.5 KB Created: 2021-05-08 18:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e6fbc32bd41d9963c5ff835279af530 SHA-1: c750949624455f2b5d142c27f43c36f9523ce25b SHA-256: a522fe0c96f3bff3bc6540abfc0730374944ca3bbb7dc12303ae756b66cdb309
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1bc70eb0ff749c0dfb5d14d92a37cb03/27969298976.pdf In PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/90f3fb52f5ab5de694568f916df0da6b/6013570001.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070021cba527---99057019390.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ea78a5ff69326701fff95d72ac7fd044/5965644799.pdfIn PDF document text
    • https://bursac.net/userfiles/file/silapikupivo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p22f3pqivsrle2g3d01u8oajs3/fovedegenenosowatomed.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8954fa79---17075730668.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qbnvppcp887nsr5e1tonofrn4a/35275228730.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/29f333327e19e816525cbc2e097652b3/badasodudavoxamegigev.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file/%5C/75479562281.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/17b45b7b804c073c589cfb15221d2f2a/88222605037.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7f7b74fec099d75116ad8b33ffedfaff/68183994779.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c9f81fde---pibebigorebojukafavavifu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415839c0d8---82639352982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=build+royale.+io+apkPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/86564a285078e5e58d5a93b03201c998/20954430811.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 4716 bytes
SHA-256: 7ed5c36aa8efd118a40f51b5ef53756e40feceeaf429a171d73200867650af64
font_01_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 10700 bytes
SHA-256: 145c8ca9b0d7dc749ed6a2c8cb75d9d0ea16e56e43ef2c23ff81b1646f476cfe
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 18260 bytes
SHA-256: 4de06e0e471e2a38a09137a344ecf6fa0e50ab7d6d339afa3f9d89cc4aa2ff8e
font_03_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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