Malicious PDF — malware analysis report

Static analysis result for SHA-256 456bee9eebaf7234…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 09:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71d2d6e3e2bf5e241f822c6556f6b480 SHA-1: bc047ce7972b67294de770b9963828638dde4dbb SHA-256: 456bee9eebaf72349880893d58c0d3bb0d939b42eed4e54a316f94387be9148d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a broad distribution or phishing attempt, likely to deliver further malicious content or steal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b105576ee---bukafiradolotizusobib.pdf
    • http://makinsushi.com/uploads/files/96636888170.pdf
    • https://washlounge.in/ckfinder/userfiles/files/rejigenigopape.pdf
    • http://formacio.fic.cat/uploads/file/16376938847.pdf
    • http://www.mostex.sk/files/articles/file/pebakokexupef.pdf
    • http://omni-links.com/images/blog/file/5411487001.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/nerekubeno.pdf
    • https://pasifikendustriyel.com/userfiles/file/75622446780.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2198947eb671d0d78498b409758ff8f5/88649956749.pdf
    • https://brs.jo/userfiles/files/2909762826.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/49394535081.pdf
    • https://weldingportal.it/userfiles/file/jogagavutivekolajifopu.pdf
    • http://otohondamientay.com/upload/files/duzut.pdf
    • http://sp3siemianowice.pl/userFiles/files/21829410276.pdf
    • http://radecznica.pl/userfiles/file/xoduvowinitisisa.pdf
    • https://njshore.drinkpoint.com/uploads/files/98251298860.pdf
    • https://clubselect.ro/ckfinder/userfiles/files/44442110444.pdf
    • https://riondene.ch/img/uploads/file/gelajigezataxujorirev.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e648a2e61---tafarumujoxuraraset.pdf
    • http://parquet-cortes.fr/data/Files/dobexazox.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/tamisaxaziruvawajivetos.pdf
    • https://perkunasstudio.com/uploads/files/202109111201121325.pdf
    • http://clingac.es/d/files/31652891440.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e98a662b---49103761836.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=iphone+system+for+android+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 16792 bytes
font_01_sfnt_off00010129.bin
52740c6640da8cd41c3d76a312b33f9ad4b643ddae58528c4d569e621fa4e1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10912 bytes
font_02_sfnt_off00011a44.bin
0175fb3b17af2518acc38f8090b1b36a8fd0773837a90292f478be067073d56f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 18156 bytes