Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57fc2d4a12019e1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 10:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0db1c1ded340af0f2596d6ae3dffea8d SHA-1: 856623bba964e59075fa27194bfe278a0158b4b4 SHA-256: d57fc2d4a12019e1c6925880114d11de087d66e318644b2e7d41ee0bd7f54491
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f3e9ef36---nadadosowin.pdf In PDF document text
    • http://www.musicboxpiano.com/contentfiles/82171096220.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/40345488677.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5937efac253f0dd8769e33cf578fbe23/14982606572.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/51176667198.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/i5c9ofg0ko2b138kdv62lcmhs2/35494027673.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/35638899602.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210914165408825964137.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe2a298fd---mexalofugositulazapav.pdfIn PDF document text
    • http://citty.org/images/uploads/file/88748429303.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/87089314260.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/kevafi.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/90891715581.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f486683dcf---kunemerejugibavatena.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/65721324546.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/dasutofubugod.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/53574392758.pdfIn PDF document text
    • http://iphysiology.ru/upload/76545064603.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vesasuvuxebegajikanelo.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/3927486427.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/widonusatulixipixune.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dl02fga20q2f9nt9a09k8bg67p/94060113257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+app+testing+interview+questionsPDF 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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 17456 bytes
SHA-256: ab58fc90a9519627e6b511bd79a5e3aa352fa66a1f9c3c342017a44aedc3212f
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10900 bytes
SHA-256: dd8e5d75ba1a6266d59e374534e86d2085778f46b48892d0f2f70f4f662ab6ee
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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