Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed505021a2ab8bb5…

MALICIOUS

PDF

116.1 KB Created: 2021-06-26 13:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b390e1dbb47c2d03bc50442168ca576d SHA-1: 2161d65bdcb0d885900d358e2cce4f9640e68d6c SHA-256: ed505021a2ab8bb5bb31b2e5fa154b244e76de4ef2a69cecda3fb9bf746ebcbb
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://implant-drill.com/userfiles/file/lirakuxelunironud.pdf In PDF document text
    • http://gfb.it/upload/fck/file/mumununisax.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/44332870671.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/71382051476.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d43f75b6d655a07748e75664729a1fdc/16956308532.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366f57bf1---54724012598.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecacb27bea---11553206390.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/40691609643.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ab3ef9a9a620811401bff3317db1b786/72575584398.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b48f0250c---ruzuzewosiloborewawig.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9003526e79a0629fb0b1c66f387d93e3/luwukulomusuvexukawidebog.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/neaqjs7sal9qg9upl9ur8mj2im/18989666125.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/woveledojewos.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897a50afe1---venod.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a94176cd1---31431912818.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/29358686449.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/mumawerowukasunezinaja.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0e4a35e48fb9e19fe7f63575c8f5685c/napuxarowiroti.pdfIn PDF document text
    • http://c-amc.com/upload/files/dovinenonevor.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/kirizusiselitodokatana.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7d58baa826b213ae1c73b79600d1152d/bojebigurefi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/29096069882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cxc+past+papers+and+answersPDF 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_off00016591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16591 17556 bytes
SHA-256: f0233da76923ba6877c4bfa84f6ba6e36f633f300cf00589b457ff35c3828939
font_01_sfnt_off0001934a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1934A 10468 bytes
SHA-256: de009cf33ef48b67e1af766cb1a404f0fdd60bc37cd7c5a60a33ae3bbf6e0ae1
font_02_sfnt_off0001ab4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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