Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e67fef129f52d0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 08:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49c868d0d4c541cdacca977a7efcee61 SHA-1: 52f48b206b5cd1bdd2cc82ecd9dad52eca6d7386 SHA-256: 01e67fef129f52d06425a8704873e5de4439ea48fa9a5a6b09caeea903eb9d5d
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a high number of external links, many pointing to disposable hosting or compromised CMS uploads, which are used to host further malicious PDFs. The presence of a 'download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yellowmangocafe.com/userfiles/file/sawaduvavadetijofoz.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/lisetejub.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140d1cec1f45---rogunufasovixogikutuwikar.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/lejuzimibumakugenogixaj.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tiremitoxo.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/23507312656.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fjt421te504i0gb2mgfvurc6s4/lipakideruxutasotugasez.pdfIn PDF document text
    • http://poultech.net/d/files/tosekizi.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/39391556897.pdfIn PDF document text
    • https://fivetc.net/uploads/files/gebunugaludexodad.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/mipapudogunibim.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/zilupiw.pdfIn PDF document text
    • http://klpa.net/userData/board/file/38079096338.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/71302231257.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/47921286930.pdfIn PDF document text
    • http://vce34.ru/attachments/file/20954161515.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161428f5daff3e---86201753879.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/5366422579.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2c5ed32f01f1bb4d76b226d62cd1d6dc/kovalepesanurum.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/76488119197.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jse1p862lemrth49cccar06ck3/91674063109.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/81559307358.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/mugetiwofupumesezobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=qp+gallery+apkPDF 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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10108 bytes
SHA-256: 7a87000bfdedfd2f92d6ca27c7909cc17a424e44471fbd286cd560d5af10f5eb
font_02_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 18576 bytes
SHA-256: 7ae15976f33473ed9517d10d38cfa6ccf5d955458032184f938373f573234160

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