Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f674752d7e627e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 04:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b9b51d07704d4749099fae6530e9844 SHA-1: c117e2d8519e0415e07932869afdc51bc0f88237 SHA-256: 95f674752d7e627e173bbdd7ae6bb924543c05b38b52ed79c2eb6b34725e85e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection and ML classifier further confirm 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://kentacademymiango.com/userfiles/file/zusaxolomibano.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3eb90d539d1fc75b8dac6b7955a3bd96/53092960930.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/liporefodidojuruxanij.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/35107636693.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825468bd09---81738478408.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/budosudubakutifurovax.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/kenidozepunuze.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/jozupofimumiroziruz.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/gokim.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/87171277076.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/23450461119.pdfIn PDF document text
    • https://baongochoa.com/upload/file/46902526906.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kojenibikaxutujosavabaxer.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/62513806720.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/kusinugovosorifupajav.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fasuwusamu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/26718747968.pdfIn PDF document text
    • http://fructusartis.com/i/File/48791385064.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/23579024867.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/momewovokipifewuf.pdfIn PDF document text
    • http://medrea.ru/upload/files/49689043579.pdfIn PDF document text
    • https://tavio.ru/files/file/25381179317.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/kosuzamixej.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320e00b0230---dakevivamaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mykkie+skin+injectorPDF 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_off0000b655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10344 bytes
SHA-256: db30083a8810ea7f5004fcc3e042cdc4ee96e0d25613442531e08932578fe046
font_02_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 20164 bytes
SHA-256: 76107f852953f9b39fb038e6baba9daa429cd26ec8e8e71e372ddd15a7c19945

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