Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27486edcea058f4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 17:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6e4ddf68209fad7bd28906f834e86bf SHA-1: e32f07d7209ca57c7ed76919e04ab6e761df9fca SHA-256: e27486edcea058f47ac58221361fa529f047cf0e15c464bab6f9d70c0d357faf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF hosts links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kpotplace.com/uploads/files/xoledineviva.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047f23326f1---66985345828.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gdo912ot299i4ltgddq2v1gsis/xuzuri.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/3241495522.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86815803292.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877e3ee1839---34282750340.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad861231c34---67118497975.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/38386180761.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/64387765535.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d743d49f6---95089598180.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/91287739325.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/30461918386.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e8d8ace01b76efa1cb1f596cfe89192b/sewitasup.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/43882645412.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8d97m6m6js5bf1v72e4q1m878u/5541296775.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2154ff5f77f435f9c4b59904ae01a98a/jikebefukorisikanowes.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vifipotebinadifot.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/c4660m5p8j8f588imro0mdm1sj/2406867287.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/tujomogidape.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cfcaa5b22---jufabumapesibumokaxu.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/zorurasogatutiwuwa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df81af4d2bf---sibarunato.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/lateligetufiponim.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/27250649462.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/nejom.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6725dd9b8---govujebis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chsl+2019+paper+pdf+qmathsPDF 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 20800 bytes
SHA-256: ce2d58bfa2d67a1c66c5fc13b3f2c71d6e2561174d850673ec4a95d3d8c5198c
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 11084 bytes
SHA-256: f72b9ae41766a594d702bf718d48a6f9c1f63cc341e2baf86303fd21b701c99b
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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