Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6302bcee188e2d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 19:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce29c7776f74aa9b09c8984445a06477 SHA-1: 7d4244a11493598bdb98d1929319b76829b63ebe SHA-256: bb6302bcee188e2dee42d105608aa00391ff67e554e5468c3c26d05beb1873fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://honda-vo.com/upload/file/nasid.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4b83971b---1601192818.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/50002639199.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/73181400027.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kixomogibafele.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d8ea6108---fivaxidusevuf.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109101109282880.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gevulenumefufegup.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/5821549488.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/petubi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/61402217225.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zokubititi.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/nanojufe.pdfIn PDF document text
    • http://school15-tyumen.ru/f/bodevaweba.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wemagadezakuruxezekorex.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/99571525459.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/37565541144.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kisefamuzoxew.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/23750971120.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/21231223233.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4b8d9f62---ligizet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hardcore+henry+watch+onlinePDF 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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 10492 bytes
SHA-256: cc569fa225aa5b803eec2d28ed8e8108039e922c9c69ef550a4f55f6ba19525a
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645