Malicious PDF — malware analysis report

Static analysis result for SHA-256 adec2057dbef6b27…

MALICIOUS

PDF

95.6 KB Created: 2021-09-02 07:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9af16476af4fb9d6159829bcf01e005f SHA-1: 927caa4d453a4385efaf5dbf253a9256525f282f SHA-256: adec2057dbef6b27bd2f929c4ad857d336d974d5ce4097b619685cff8b0e882c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kaimano.it/file/60593875317.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/333377a3d17cdc3de8477de5940e7748/fegoturavetopa.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/fazexosab.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/dirovumugapisojadezevub.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9910f20c2e---95488941209.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081edddc9417---31114373840.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/bawutu.pdfIn PDF document text
    • https://cecprint.com/images/file/95815079312.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/41728405331.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5188fadbe2---53544364814.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/72184126697.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/87932734123.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739270975cf---60136840643.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/213894cb6b330564d2f802a792e7019e/lenulajeb.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a9f2550eeb0fd01870c33e83e31eeb1/42375453274.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/vivof.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/95159312296.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/lemekifulalif.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c4538nnqodisp02aitf6ubs3li/tasawunejinojuwanetaz.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada9ff06fb---92188278507.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9d88955e5---68266492285.pdfIn PDF document text
    • http://aimic.com/userfiles/file/39873934106.pdfIn PDF document text
    • https://wineart.online/userfiles/file/vilenelizosokipanidig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=highest+maize+producing+countryPDF 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_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 11180 bytes
SHA-256: 5a5e87074ceb1da7b08c559d337761c2c3ed31f214afa3e0f94c4eaec67fa58d
font_01_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 19116 bytes
SHA-256: 789e923f234c9c1f848590e19f04e654d2e0109fc22852621ff5ffa33e6b66ba
font_02_sfnt_off0001587b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1