Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baddd539f555f9d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 03:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84ad23312943c352e2a6c6b8030ed411 SHA-1: bae8a8b6befddceb599e3b827066cc62e1e0de25 SHA-256: 1baddd539f555f9dcd7429602c3b73df396a3f5739c3d01969f52756a9fca07a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://telewebmarketing.com/FCKeditor/file/xebasaxurabeva.pdf In PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jovesunewowegomirofalule.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/dobopofelulifafaza.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/1c55f2094d1b8fd2d30d4ea769684598/97983159307.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/lamutofaxidarubamim.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/54268996629.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o5a9686mfj72i1s4l373rhg2l8/katenogewuwetonademekol.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8e36935f243bf8191c10d8917998356a/manojatixavobutoja.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/jasenonozodul.pdfIn PDF document text
    • http://texmet.pl/userimages/file/furosebuxenelafog.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/gajoliwigijobotemaxixafup.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/riresugab.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/87497629595.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/71781862512.pdfIn PDF document text
    • http://billsky.ee/files/file/96199555133.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/51839027594.pdfIn PDF document text
    • http://aps-mes.com/files/file/balimudefis.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ie38tssci3iqel7pe4jq9brtt/6374750018.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eb0dd373---nujuduru.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/60195553467.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/gexexowubixumodobufazem.pdfIn PDF document text
    • http://allycatering.com/userfiles/bepij.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/72914638444.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a6339810fae69c7cb9dde607d5f01dd9/vatononu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=white+goose+with+canadian+geesePDF 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_off0000c25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25A 15752 bytes
SHA-256: 58c8f0f5db42ab622dfca2830bafe8cdd3a82a43165ccfeca6355821484ee3e9
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10580 bytes
SHA-256: 7cea04d2c79b6517b66182d841807b812b5d4b47519bc534d40e8fb235dbd04c
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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