Malicious PDF — malware analysis report

Static analysis result for SHA-256 4697cca98b4df6b7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 05:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 190e7d86d90e5c355691c3910efa346f SHA-1: 7ceea57d75a81839a6b70d66e07219308f55e99d SHA-256: 4697cca98b4df6b718cf013d6ae207c58fcce812ecb7231fd05090092c739da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bogaarchitetti.it/userfiles/files/jevopemexasi.pdf In PDF document text
    • http://mywymc.com/userfiles/file/34729434020.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/podebefavilijixajusoliw.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/sofobepodufobefesadeg.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/kivuvewego.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5ac1eac244276341740badfbf689b59b/87750078307.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/titig.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409c90201c---wunudizosogadesowidamuzij.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/podidabekibofewi.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/degapedaputugugoguxuxobe.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/1739482866.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f61d39c3167719d4d13df90ed1fd3db1/nonosapowafa.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/suvutafetakuramokokubower.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b6243ac103c---17743330073.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/pasuwavixigawile.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/42584062241.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/29758253967.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/pubiwu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80fc1c9d0---mizisijasarekakusodena.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vibivapujugunojema.pdfIn PDF document text
    • http://minerva-collection.net/files/files/14507123327.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088357dabf31---zoforatasi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a89fb05b1---77084659593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=triggers+for+anxiety+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 16620 bytes
SHA-256: f99edf7fede7c927a212187285be09dca6447787e7737f445cbfe771fa3091d0
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10804 bytes
SHA-256: 954bf6de7f5c6f1e57f236d67a80756682acb4181e69792b56e73e0dfe87b21e
font_02_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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