Malicious PDF — malware analysis report

Static analysis result for SHA-256 866e3cc5ffba68ee…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 22:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 98814581ad5948ac2540899da0721729 SHA-1: 3ef720fcbdf6e29cfd8e363ceae6a6be88c31d8b SHA-256: 866e3cc5ffba68ee54a22d4f046949abf74dc0b83bc536f3a6e79a25de13e2c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=nihongo+tango+speed+master+basic+pdf PDF link annotation
    • http://uniquecharacters.com/upload/files/gegesirubowulofu.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/nilamaloxanog.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/sowade.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/77798f9b278077bf4acd47feea43a577/14696421348.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/sq7pjassqhsfpj5scfqhqdnh90/besijanakajexozigojulo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/59932011923.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/43bf6456aba6ca455d01ceaa1df37e7a/kezamopilakoxifune.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/20695659169.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/55695945890.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/14080164983.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/29246102431.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/80029518490.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161207e6b753e4---59736965938.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/naxosipe.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/k0h4595rkgt2rque944btt33vd/kepivida.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/nizobibesoku.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/falutamejuzokomo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/52635462864.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/gesuvukuse.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/76428680674.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/30536011330.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/xizuwarija.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/snah2aemgn5elfmb4q0lpn9jct/3238120880.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec2faad67---rofolovuziwilogal.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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 11136 bytes
SHA-256: 3960108d3651f27b1837f7b040608a8a8c04cb1ebe9bf9080e13ffee6478e48f
font_01_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 18952 bytes
SHA-256: 481cc06744cf7b91732a4210e251a6489d2c3fb789325513158080e0f14bcef7
font_02_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.