Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f15e246d18a577…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 12:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26b7409d8fc71662650e4849e0a399c7 SHA-1: 9456ebf8b523000af185627733e24c4178ad7c82 SHA-256: b8f15e246d18a57700371aae812e9aae4ac60d3ca8265f552f32a2478020f746
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript likely serves to obfuscate malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://abwferrellpkwy.com/uploads/files/95509472214.pdf In PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/57024379325.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/68870785164.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/pekiruliri.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4i2l4fdmg95l3r18bd2ggc6e4/pagifusagofigaju.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/32437535655.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7325a436750ee24db6d4383592406367/24031028546.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/papijudumokizezezasat.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3bd1b3f31---xixafesaxowad.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e30003d9989734dce306ec4e57b5d255/gatizukemugawamutob.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/60981465344.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/cc008284ccb47bc9f37269d2d0b50d0f/wejurasawisosojosabejot.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/vazilofo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622526203148746332.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6ov4mdnptigpql4o5umr715fe0/duzukamilegozedolubal.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/88831335617.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cd11d3e0---xixipem.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/nesuribokagesodorexinuj.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3ed23e6eb---24752941846.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/xojaxovuwebavux.pdfIn PDF document text
    • http://intergeored.com/upload/File/ganorepakalarotira.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/883686036.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xemebatudopixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=%C3%A9valuation+droites+parall%C3%A8les+et+perpendiculaires+cm2+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 16556 bytes
SHA-256: f13ea7e8b74ccbe86e01bfe4d5efde6fa2f9fef470e4f57354e2d9ba12a588cb
font_01_sfnt_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 11220 bytes
SHA-256: 5883640f173ba4d91b1d26c081efeb06a21df7bd4f6ff5675cc9b5bc8c168465
font_02_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 17228 bytes
SHA-256: 8b203647c031ea5866f3933c57247c9d14adbc1b75c40e6d952852b6524e751b
font_03_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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