Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c8bbb7baa975b9…

MALICIOUS

PDF

88.4 KB Created: 2021-08-06 01:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5da01884f0cad33db482e3bf3dedf0ee SHA-1: efadc8794283d8ba956cbd19cd93fc8b090a4928 SHA-256: c9c8bbb7baa975b9132ac01f0e173a93d3e45963edad64364b07b3dc61f99caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to malicious content. The presence of multiple URLs, many hosted on potentially compromised or disposable domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ba0472ca---lorotolaxamarized.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/qsvvgabf1bi2ihn5sl04q2g7a1/36467967584.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/62601825735.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/fubojodepevokurusaliwi.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/topofomulexovelelijuva.pdfIn PDF document text
    • https://zhansq.cn/upload/file/56501202865.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6c8b0f80---suwujupetubefakovatijoj.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/1378662288.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a54afb63acc28d1ecf9435ff6f0de947/xejijonivibisirunirunibav.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/tewenamexusikuperolop.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d81185b---tidufinefijovupokibuzik.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/kofosopapoxuzuseki.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/15172883201.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8bt046o93800mikmfsedjb6gpc/mamuwazujurufifixozufubub.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160728d732095d---patuzajovuge.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/52805727022.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/79597313470.pdfIn PDF document text
    • http://oodow.cn/upload/file/210619010830051872uuywesje1gal.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/zekekubaxavafoso.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/65918983730.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/80017463634.pdfIn PDF document text
    • http://ubest.ru/images/file/84370326459.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/50397993506.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210714_8F95A0DA03683D83.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f189f9c897---pakolijor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=why+are+my+widgets+not+showing+upPDF 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_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 17772 bytes
SHA-256: 04fdf5276909f46804f918eeaa908e5039e07acdaf930d2bc3943c164769e28d
font_01_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 11084 bytes
SHA-256: 15fb8723ebcd51035bd156ff59aaa8c4ff2c6805797be89bc35661cc301f7179
font_02_sfnt_off00013a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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