Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b56ae7d0ef2d04…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 06:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8ba2f7a53bd592ddd1150465e26a96a SHA-1: 13a5e90ef4cea80cc685a3cb71b6949398643b4e SHA-256: b0b56ae7d0ef2d04e843f6f1c0140b5cb1468397aa889e8f239021a2c6b72ff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, redirecting users to various external websites, some of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queure.ru/uplcv?utm_term=mobile+legend+bang+bang+5v5 PDF link annotation
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rofawovam.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52169582384.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/63834998402.pdfIn PDF document text
    • http://samtekelektrik.com/files/12351434936.pdfIn PDF document text
    • https://unitjaya.com/contents/files/dixapafujiposefoda.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/16276674811.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/sevove.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/falixepolok.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/votosikosovokuraromila.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fu3gtu00psldf1l4baimieu4rt/rimul.pdfIn PDF document text
    • https://techlan.pl/files/file/7534350642.pdfIn PDF document text
    • http://oris-am.com/editor_up/96360270297.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/somegofutule.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/pasifodoguwib.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/66198698934.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/bebefojoxizosolurorujat.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7802cd4b---37439825666.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/10859508432.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vuccjjia5hro3i3da5uicrpsm6/12148933536.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e808b186d6fc52a184a68845382af92c/92845896926.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tixozomexesa.pdfIn PDF document text
    • https://khanikango.in/file/xugowafis.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_off0000ae4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 17000 bytes
SHA-256: 3574cf7d5aa27ce750262ab626fb6a6e2661f6ba00be15eea0babd56cd86d4ee
font_02_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10392 bytes
SHA-256: 57f0f4152893612273b31b6062df19f89193088eef60b479c94ac01d2f0026da