Malicious PDF — malware analysis report

Static analysis result for SHA-256 350128e558d1eaad…

MALICIOUS

PDF

173.8 KB Created: 2021-07-08 00:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c048fa5cb120f887f105c83c7ba3f2e SHA-1: e0809a51a5590aeedf56630027cb6e9faba6e008 SHA-256: 350128e558d1eaad964a029736f6593f3567cbdc95b4b8fb2cf19ab71e30e816
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and linked URLs are indicative of a malicious campaign, likely using embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 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.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0256992da3---kezemonogo.pdf In PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfab18f85e---18879288261.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/27938023790.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/9674536622.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4127ec95---xusefalipusod.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2039a4d672---kalatodimewelutuvexo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076788b6fb82---fadomemamuxajig.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/b00qlfl3kf8ie8vet4qqmcjksh/guwejibuzafitotitenigol.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xovigagibokogepuravi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160720e682521a---34160852608.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/30438784510.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/55734900421.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e06f0b868---11410223839.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/befonotusere.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/28949989194.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/vavadavomobig.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9409366b---6700327736.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf87a26c---96702036764.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/81535265824.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9561079dbb---69645791342.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/49bap2spfn819ck0k6ln404ipa/nijefatanimolulamig.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/11671924250.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5851042c---miwerenawatemujitukiso.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217203686643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=directions+to+kennedy+airportPDF 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_off00024631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24631 19728 bytes
SHA-256: 0bdc739231c861dfb221d247a907a68f4a7dbdd0672e39de1eb2ef123edbaa95
font_01_sfnt_off000278c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278C8 10668 bytes
SHA-256: 091912935186336b6fac38f6583382c91e443986bb8e3a1a277edacdcedad119
font_02_sfnt_off00029170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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