Malicious PDF — malware analysis report

Static analysis result for SHA-256 675a9367ae2dcb8d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 01:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4700ace0b06273792c90bbd69fbe84cd SHA-1: b491612f841835c0189767bbc2c3a0cf304081d3 SHA-256: 675a9367ae2dcb8de693e5ac206724c6c78bc2c99ccbcc78fa22722de5561d23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The combination of these factors strongly suggests an intent to redirect users to malicious destinations, likely for phishing or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://flyingfish-stay.com/userfiles/file/xunozavaxan.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/49577432926.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cefb36a50---volanibafowewujaz.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59788041c---wevemaf.pdfIn PDF document text
    • http://teplospectr.ru/images/files/11067618559.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bcbtk11cppp0degk95pvnoedd2/melorotovewogipu.pdfIn PDF document text
    • https://flomogroup.com/upload/files/nifamaxowenipil.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/173e5cb2ca0fce21a064165088c6a6ad/kupidafugutizegudiretir.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e30506b252a---mowewiredin.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/wigatoluxal.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/zidakedokojepid.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/taguvawujuwevirosofopa.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/69897ee1d9581bfab3aa499a176b0222/wusud.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/somunojekexogi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a01a3655aff8387577a397f0a9bd4f7/sowoloxolupak.pdfIn PDF document text
    • https://schmitz.cz/res/file/muwedovirenetozodav.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/eb6b3cd488d63c2e59585dd62ae2227c/87492077148.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/eb920cee358f86b7191ad12ce0808c9d/genezabewekimogubofafijuv.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/6545629480.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/092ff0864e232babb0a1778e09a74a14/rakenige.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/rarekewepewijofixawino.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5b00a3b3---xarovez.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/96903605566.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/22654707379.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xologekimaroromaripajax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=list+of+words+with+silent+letters+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_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 10476 bytes
SHA-256: 9fb6756bd3f1fa3af497b02a04f16db2db320869141617fa93fce21b97bd4c4c
font_02_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 17180 bytes
SHA-256: 14029b1fca7f23750a8a4ed4371bda183b7e3064f804c267128cc02c9119907e

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