Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f8ae418968d21a…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 07:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a918f29e5c913ff8f70e35b5dc9624f6 SHA-1: c23b6167ca77951700f74e9bdd9f619ef9be6293 SHA-256: 85f8ae418968d21ab358cd6f510ac00843fde6c945c573a787dae6c91f1e3dd4
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. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics indicate it's designed to redirect users to potentially harmful content.

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2fa7f03f6827fa6c160cc223fe8c1ed9/lunogevajetifonekek.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4510e5afb---bokizagerep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72a10c12d0---85625223436.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/juxinotusuwigi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/17a0a0d5783b6c2359ec84663ccefd12/86742429426.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/tomojom.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160781a67135ca---dogezajibedefilevopepiw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75423bb3cf---75685644074.pdfIn PDF document text
    • http://proxima-design.cz/files/file/22111074804.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f75e643ca696e2fe3807165fb60dcb90/48685086218.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///lelafilogegemu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/87366927241.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf28ab0b82---32079591105.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nufolugobadurif.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a697305164c---vosidet.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/guguwo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nepibilomesusuzukemur.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/27102422380.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/nakanapojirobonewip.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/fitokuv.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106112132136983.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf9e77916f---54966339382.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2cb439e9---palusogazagi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/56331342533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=house+construction+stepsPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 17656 bytes
SHA-256: 46d34355ce76735ccf9747f2745c19b147ce4157de68cfd1ebbe393a48a5ad16
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 10248 bytes
SHA-256: 2cad3f3dc530b404ed1295302d043e1a39f215d5b27df4d3aa5f100e341b988c
font_02_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1