Malicious PDF — malware analysis report

Static analysis result for SHA-256 d386fc30216e6878…

MALICIOUS

PDF

94.2 KB Created: 2021-08-17 16:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6a42503a4aa769e2ed18e19fb6c3db6 SHA-1: de6f0650fed81206b643900909726ba85366e16f SHA-256: d386fc30216e6878416517f67a81f4ec9baa74fc9c82deed5673f61f6e1630bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs, several of which point to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URLs suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://zdrowejaja.com/Upload/file/32777419415.pdf In PDF document text
    • http://daiichilogistics.com/uploads/news_file/zerexan.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/60214425813.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/37835562371.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/78569308593.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbb4685b64---50574585740.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wuxukidebifu.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/dovajaredigezu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1229a0aa31d96cf95e8fe94dc9bbda63/xuwebodikiwato.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1934d25f---zisowusipunuxofewoze.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbcee5e7ca---buxojujerejajevekasekovam.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7818136d87170d207da693c9f04c3bf5/sukasexazodudil.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a2e3f0a8d86a6baaed5265f29925b16/vubekugadawawedizaniwob.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/62755526262.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/sugivul.pdfIn PDF document text
    • https://baptistfriends.org/media/11935209731.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/48058187719.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/46419698161.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/beliledebugagarew.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/84d2b05720841fceb23354f2487354b0/50281628043.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a705bbcb9---64752351575.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/9488423807.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/16073382368.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/wosiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=arjun+reddy+telugu+movie+tamilyogiPDF 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://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_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 17708 bytes
SHA-256: f00cf77ee4857bfd643894dcff9ff082099821a9fcc7ba30dbe8486ec9f333ef
font_01_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 10816 bytes
SHA-256: 9737e83e218e0618b2dcb902c078c2500b23ea7bf1b3daea9bf9cf875e6e023b
font_02_sfnt_off000155fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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