Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cf603b1eae256a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 19:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e5cda3f7358e97abd3fbf66d9457905 SHA-1: 1cdaf129d517c24da3fcc8a81d554ae306413961 SHA-256: 65cf603b1eae256a83651866d3a9b2f6f12be1cc4a8de1c3dd465e58b209a3ee
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gps-tw.com/CKEdit/upload/files/73564880023.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dc26nk50h187r7vudsgid1ftm3/98559861314.pdfIn PDF document text
    • https://solturism.ro/images/file/samazogarid.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/numipuguniximolemeporip.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/28678427995.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/taduv.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/39688562685.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/58096542583.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2ac65c01e6e473719ba966e09f88d6f8/sotitizigifafoto.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/munifuzoxukes.pdfIn PDF document text
    • https://majubesar.org/contents/files/vafepegunugi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613819e61e7da---11822604022.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/wogokanoritaz.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/20362605289.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/padiduvazusumanagitakig.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/katurolivamigalavej.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/68736335072.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/9102275199.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/pexuzigavuwiferipexetox.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/gutew.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/kogisipulukonemopu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/lukesuzejuzilapipusigul.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/vumide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=class+5+science+chapter+1+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_off0000badb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADB 15836 bytes
SHA-256: 9d52d3463599d03784352cc0803457ea69cad6135d0c8e564beddfb9b1c334ca
font_01_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10816 bytes
SHA-256: 1f2ddcfad050f6294257687122afcbbd06a0c0e303eb6558ba773348a0fae2b0
font_02_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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