Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd191a33ee56d2d…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 19:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fba89281ca2fd94687d6f05bdae53aa SHA-1: e1cc5dfc7aa9892a94ffc83bd7c61d7a57d44dce SHA-256: bdd191a33ee56d2dacf68685777c23af37beed83bf34afeabd1501e20236b6b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms on potentially disposable hosting supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=detail+in+contemporary+residential+architecture+2+pdf+free PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4c38a2f90ade6e4a834b474af4071729/kamulo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160986c53e0c32---63736277141.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/4714021109.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9991d3191---sodutavutokowokasogobix.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fevipobula.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d8653d82---8356962440.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fedb7d10063d6c113e906007b129cc00/kukojixejuzewew.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d9a891db5b959dc3fd4d8a7a50c2fc72/rulotuvug.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b68d7c6b2c9d2c09f81d50d2df0a0083/demirefowijow.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd6bcad6---44279516060.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/menowaveragejaki.pdfIn PDF document text
    • http://szpk.hu/_user/file/boperenujixapowuvib.pdfIn PDF document text
    • https://isosklo.cz./uploads/26625752443.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/77e18ff3556f8276782f2d80ed6de773/zobezil.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///zikotu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ejefjlgq2u47f2olvgp4o7p9r3/lezolelufurumozipiwoze.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/115e59df06e1e32583f69d16433299a2/worarumod.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/55015635733.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7a78f670484f7d622d7ce9c3b6d24a17/wuwipisigun.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e3e9e5faa2391c39655ca701f20554e4/vizud.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jedejodusokubowolip.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b681ba6d9fdf205bfac42283cefed8ca/56112687955.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/50709828065.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_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 17312 bytes
SHA-256: 53f4ed589cb6ffec531e70150677ccac6637e432ee3acb23d98f35d941c81cc1
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 11220 bytes
SHA-256: 4b0d7bae1b76eec318469cd8ae07a5cecf813c5e74b96cc8b4478b07fa3d6064

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