Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7a915f4a3f4f95…

MALICIOUS

PDF

81.1 KB Created: 2021-08-07 00:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3ebb812cd27ae7e9d6cf9c1eca3c26f0 SHA-1: 846d8365c5247fbefac2a70aabe08162afdaf308 SHA-256: 8b7a915f4a3f4f955637d8cc407829825f106d2751e49fe6c31266d966cd6ca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the presence of numerous external links supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02194fc51---58624527880.pdf In PDF document text
    • https://jxloanchien.com/style/postimage/file/nitiwibegawubolajixo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3f9582ada---gaduzixomogises.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/vadujokoboxupip.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786824cbc05---pazoxoxo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f20c4adc5---41542058189.pdfIn PDF document text
    • http://lucann.com/Upload/file/dupuzafuvipubabef.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/78e45dbfef39110b09bf0b2df4b773ab/19280183411.pdfIn PDF document text
    • https://invest.pl/userfiles/file/fedaji.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/tapigotalatokizaberamomub.pdfIn PDF document text
    • http://metapolar.hu/tmp/2858419569.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/8126553718.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/96729145088.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2dte1ualt01tlovemjhlb5rqbj/52376104324.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e3904032---52703807261.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc45c9c7fb1---28628182633.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/vumolalawulox.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/fekuliraropas.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/vugepobixuliduvaxex.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/satip.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7a255d5---13552425963.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d202df98ef6---nenutodokuporuxiwix.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/megizun.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/528e52ab84dadc6ff63cd402680b99b0/fiwafurakatajitojaramo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nepali+comedy+meri+bassai+oldPDF 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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16948 bytes
SHA-256: 76bcb42ce9187676e60ba2717fd88c24246ee45bdcd791fc772555313e87e04c
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 10704 bytes
SHA-256: e11b2cc5478dc19bd5ab6a3b75c28ac5f0be84754038fa7d58f58257c09586e3

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