Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8f929b61a86da2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 20:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45aa3d6c39ad230800763013e7e7ddac SHA-1: a2d847d4df7939d36c4f74cbcdec15f479cd8e2f SHA-256: 4a8f929b61a86da24e72da5fed55f411e3dc1d94ce1a87b8c80e00579adc3d1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term=facebook+video+call+download+pc' strongly indicate a social engineering lure to trick users into downloading a malicious file. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=facebook+video+call+download+pc PDF link annotation
    • https://wineart.online/userfiles/file/temijojitiziruxadad.pdfIn PDF document text
    • http://artdental.hu/editor_up/lebosakeb.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f5b23e30f1f88ef9c4765393dc9ed1f3/lujede.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sarisefufotezosusijoto.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/42545069407.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53ca14f64---jenugetosutu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/33971515946.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vipogo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097de02cb5---puzuwovegaremukibuwabewub.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142233e05c30---jinovimu.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/jezesinitexafudajojekatog.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138492f3788b---ziluborixo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/50e8c4ce30556f65a963d8c08fb29d0b/pivebazolasumobu.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/joxuvawurerovetagura.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b3006d303678c1d750bcbbf62ad8c020/33138661549.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/jifirovipomemixeloj.pdfIn PDF document text
    • http://megalaserasia.com/upload///55347768852.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458421dd208---wuwinowajojomapurene.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/5655816085.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/73386478440.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210918_F856AAA8B0136DB4.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/7303018255.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/dokosotatuzize.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://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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 18596 bytes
SHA-256: a4ca4099cf94c9c847dfa770fd684c7a0a5d41d2815e612a6a7dcec9defaa6b5
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 10504 bytes
SHA-256: e35faf9e4064e3f4aa42f994a523520234bfc872abfce961cb2e03442538366f

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