Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd25efde7a0cbd1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 12:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91df639daf5c3bcf0988182501b77b87 SHA-1: c31995935131ea35ac6b688a72ea3a62eab9d6d8 SHA-256: 2dd25efde7a0cbd193b5fad007e860f0aa7909f77b59bb2fb15817688ba31996
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links, some of which point to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://chinatupai.com/web/js/ckfinder/userfiles/files/2904533250.pdf In PDF document text
    • https://shreenathtechnologies.com/userfiles/file/10439774773.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gumipawawujebijaw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc8804b0b---96281582838.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/89416150461.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/98261601965.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/gopabuwem.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe36e517a---42284080504.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/japugowulotokuna.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/93419004916.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/11495670840.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210908_647AD497D41BB2D0.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/3969259452.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/divabonenoxasewo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219949596658.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/pejigewobogipaxawerawite.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jp7ipt3pom6vktr7b48ko6akt1/duwezusitata.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/guziralepujul.pdfIn PDF document text
    • http://lawngo.net/fckfiles/tilafajituleberaruga.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/49328787212.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vadetufa.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/26453684104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+studio+design+buttonPDF 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_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 10436 bytes
SHA-256: 70f009b42a0aaa1fbd4eea1d2f3caf2d4003c038b78207a2fb33f1a88bd30d86
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 18144 bytes
SHA-256: 027c7cd20502d81185432dab2f840856b5fb43abf0927650c159220e9f08aed3

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