Malicious PDF — malware analysis report

Static analysis result for SHA-256 7050b82331c4634b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 03:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61d9f8080f47c1c7e30f29d318f7f694 SHA-1: 29f263c3210a9297f2bfc8d8b5f820da06b035d5 SHA-256: 7050b82331c4634be20051f7da2c0629e79421c4b54c1e607f66700601cd0e95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, flagging the PDF as a phishing trojan. The embedded JavaScript likely serves to redirect the user or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=the+clean+coder+pdf+download PDF link annotation
    • http://theheavent.com/userfiles/files/nabamefoz.pdfIn PDF document text
    • http://szhlfz.net/upload/xiguzigisanokutiwi.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/27802605245.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/sujob.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/2000121267.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c744273509---97544288281.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140208572a58---petuxunelovola.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340bc473580---zakalebe.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/13860328270.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210901123204699.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/97785526800.pdfIn PDF document text
    • http://retailcop.ca/files/pizarativadebofesebo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/80425015401.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/81581186373.pdfIn PDF document text
    • http://belean.pl/userfiles/file/puzogisanuxeva.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/3747715609.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/zonusimeguxowixureduwep.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/19777310279.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904033047730.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/44516752346.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/65umnudu3aa6t3t7ediu8p9ts1/5472619745.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/mivapawepaduwisegovaner.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/91577441989.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/vexutuxojofiwibo.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/wunuzipukoken.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 20584 bytes
SHA-256: 8e9277159420678d895734b08ad65a1df5cb65bb32f5222fdf0f83b83a2cdf2b
font_01_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 10408 bytes
SHA-256: 4cdc92365332c04769726b8a777b849e04bbe60288bc182c8762dc5a37aa5218

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