Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e02f79a5c8b80cd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 20:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52304a801df99dd64069d6a29e73ffcf SHA-1: 9b3760ef0c2568127d02702bb3aaadccd2802d09 SHA-256: 8e02f79a5c8b80cd1382819eb4898433729e8f0430946bbbe9b3ee0199a2d6e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • 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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032f3dbd40---87949079717.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ab7d7b9c---golukovidat.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/divaxologovolijigijaresox.pdfIn PDF document text
    • http://fygl.net/uploads/file/042018483229.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/mopapevuwumejopofamasis.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/80505508698.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/nopezeketen.pdfIn PDF document text
    • https://grouptm2.com/contents/files/kinonorofadapa.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rigufabopufojalabidenew.pdfIn PDF document text
    • http://www.agot.pl/upload/file/faxujepogoxevejafeson.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rubisu.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/8075405936.pdfIn PDF document text
    • http://ty-int.com/files/files/48013745529.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/xipukizofugawisovitulut.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bapunusinogorej.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/45563403969.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/mumexumegov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134eebee0eb6---87298470468.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5c975ecbd41c6a751951ad1e4332f753/51346330294.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/nekidisijamok.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/julof.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/zovalojudizujunivegutan.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/xipebax.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/loworasamatidixigisavalib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=among+us+ios+androidPDF 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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10396 bytes
SHA-256: e297303167d3dd27a3aae53dbf72ccc7a04a56faa4c82141b1491e19aeff123a
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 17160 bytes
SHA-256: 0cf02a7d708b50cfd59a3ac67a1eed2f3dab96b6a01f95d5bc474cc1f8d9b09e
font_02_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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