Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be11b9889d9fedd…

MALICIOUS

PDF

86.3 KB Created: 2021-08-08 15:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ce019b3c10f8758fbbb1f5838ab64ef SHA-1: 1f3df629d46c7c33073a22357e88ba9df4160054 SHA-256: 9be11b9889d9fedd9b840032c6c113057a58b3ffbd37f36fcb757bf973bb4853
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URIs and a link farm heuristic indicates a coordinated effort to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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.
  • 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://kaptenhoki.net/contents//files/36068166353.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/87477908296.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/25479190368.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/36268327646.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/07db233afe0001444f883e9785d7f8d0/120543109.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bac76e696---82200546731.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/kubonipus.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/99282401883.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/66488034399.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dozegunumelodabaj.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5f280fa7c8d2971db0a777fa1c55779a/84445925474.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609030a99183f---ranunizerasoza.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/gikatukisakavunovibuvog.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16101125de1add---gelexamijadawite.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9f2352b897977c5eeedab4b7abda7a95/wisumanomerokenudibuxazor.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d79de1bf---vixabominuvaxemizenib.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ba488dcefd28303ba900674d3a5cf1c3/93441990763.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64c6ca647---revagibidadugudotejonux.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/56b0vu8e1umi3538kqqa9hr594/nepifiwesanutupupi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a35a1f33d---48471031327.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/mixewajajitazoligolomedi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/psbkf7oaea1atl3t5bt4dciquk/7987033055.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/79edb4abbf5dcacd25ac4ad65c2f5e70/tezakegonopagiwin.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/momilike.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wesitopowamapenuxivew.pdfIn PDF document text
    • https://peterdegendt.be/file/23522540847.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610529b6b786c---xotax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ielts+general+reading+mock+test+with+answersPDF 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_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 16672 bytes
SHA-256: 7acaf7837005096bfa8f898751d5d5dd6682e315d70cc530649d7590aa6a752f
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 10944 bytes
SHA-256: 3c85acf3428bbe083d5be6998364d3fbfbac24439e3640118ac917081894eac9

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