Malicious PDF — malware analysis report

Static analysis result for SHA-256 37811c648ca96024…

MALICIOUS

PDF

76.2 KB Created: 2021-07-23 18:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0eee92d435753229783caf8343a4c8e8 SHA-1: 56416af25a4b505ff0b1ceb9f0e21387d111c083 SHA-256: 37811c648ca960242d7033e6022044021a0f39c33e415755ce49bebee7999f67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests it may be used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krukewittfarms.com/userfiles/file/dizikapizuxofatojozo.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/feb5f64635780ad25c452031a6c31af7/devoxemopikujuvapipilo.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/37490611149.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nh2sss20g1iqai20n5kd0esqdq/demasitofipixalubaxokinus.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8aa863377---44662984806.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zozemituzedidu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/lalodosupog.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/bagajaw.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/livonefegujub.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cubqret4lcolv0ds2u98454u8u/zemomunetidipepazo.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/65325103615.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pinabunasegi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/932d1de256e0db95e649a2e4b5bde5db/xejowaruwexagi.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/fejesesadojibimal.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sonatidebexoxojodol.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1ca7e8206c5fbcd1610094fcceda98d0/16986751879.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/borokikesuvuxuwepi.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/noroz.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/kujezuwiwuwekozizanux.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dizapitatovaraxeb.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/h50rqni05t9vbik8lmndh66kp4/61149119329.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/00eebe27510a9743950442c0de4c77eb/26148737108.pdfIn PDF document text
    • https://ambalatender.com/upload/files/70129646625.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/61b1488003cae7e3593fdc3ef38057a8/pegorufotifeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chemistry+ideal+gas+law+worksheet+answersPDF 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_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 11016 bytes
SHA-256: dd4c15d9bfc024c97db951def805dc71f4b54789cfe2a1932b267099317131af
font_01_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 16124 bytes
SHA-256: 9248dffb6097747c20b5777f6669fab6859a63be522ef4ed7c94f240f08e2309

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