Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3590d6ac43577e…

MALICIOUS

PDF

92.4 KB Created: 2021-07-08 02:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15134f182e653f3274f529196293542e SHA-1: 58aed49dfacdd382342f17c1284bdb8e235cf741 SHA-256: dc3590d6ac43577ed9e8e3929911d92a54a95859e3183ac3d06c3f09fed0a149
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://synerhu.ru/uplcv?utm_term=constitutional+amendment+that+outlawed+slavery+and+indentured+servitude PDF link annotation
    • http://esejsc.com/upload/files/8044997710.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/fugafobuzakubunin.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608310d25d8a4---32318556315.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/va8uafl2mp78envkr425t23qr1/wozopejeroga.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/95qelf4s2tg5gn9s7vbc4t4dn4/pamemu.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vejovukedarileros.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/62778283401.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2917e131c---19904442161.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/83882355807.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0c0a7aosv23ht03ms0juf0vi95/51308804844.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/fq869rf08sp0ljm5g7rlsfs88h/pilagatuxatit.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pudg6a63b8svp9lbmfd5e7r8d3/47863421324.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/71d0e94df80a3fa9e5e1c939ddee614a/97223427370.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c45d61f66---37063726255.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865b1ac5ce8---78601478855.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/33313938297.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jeloderiminegijevonovises.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bfbf3f8c3---garezevurixatugopawuja.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tetenop.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bufixuponozudusiwug.pdfIn PDF document text
    • http://skomi.ru/img/files/file/12329742505.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/fowewalawugukoxegonezegob.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/49171842386.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/32299338308.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vobilugol.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/revij.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 17112 bytes
SHA-256: 7d19a1e56a07f6c851ae43ea855903c9f8e5884f4cceb8e4305d3c1d920c1bc8
font_01_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 10908 bytes
SHA-256: 62e32a0e4e31467f5ef4a13dac06b6a29b2739033252f07d168485c0e38b8755

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