Malicious PDF — malware analysis report

Static analysis result for SHA-256 683c9d2f9e9396e5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 03:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffb63cdae1ddaa4680f4b44c417183eb SHA-1: b7930d21fff7e9ba25b67e55d2cd32500e2d7631 SHA-256: 683c9d2f9e9396e5dc882ffad7b15576049af91582f6f04e6e184ee752b8881d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to external sites under the guise of providing "astm standards for steel free download pdf". The presence of multiple links pointing to potentially compromised or disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing attack pattern, likely intended to lead users to a malicious download or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kokocurry.gm/userfiles/file/22811373246.pdf In PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210626161628.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/56745728216.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610826bc4fab8---dulevamukowirul.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610886f4d4ed8---71496345186.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15dcf4d432---darabobupapuximufuronavi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/86725282654.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607295acd33d0---81175759638.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/69f4u9gegduc44i0ieisvhous6/votunesowimubowovena.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/43249155838.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/60422994506.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/43854901103.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/timajumupigubozale.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/26792062706.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/6684478523.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/22355789993.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f89d07e7d---kukavuvu.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/62009258622.pdfIn PDF document text
    • http://detector-billetes.com/Imagenes/file/sufukoxuwinala.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rimele.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611955bf1d955---kozalalodu.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hmg1gbklu25fp7mjtrripjic0v/fatopajava.pdfIn PDF document text
    • https://polytex.de/sites/default/files/12766737546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=astm+standards+for+steel+free+download+pdfPDF 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_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 16388 bytes
SHA-256: 37c6c318bc1ae6bb4932fbf98aeb1328995edde8e8bf3f48f709568e8e0b890f
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10636 bytes
SHA-256: 534ea2d4741fe562382877f60c1dffd720eac132b5150fa6aec1393524b06bc2

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