Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f48d4507a6aa7d8…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 04:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac87cfc6584768d913285fd0af42daea SHA-1: f10110bf0da7316e5a0e8f7c834e0059f1c6be4d SHA-256: 4f48d4507a6aa7d8c8b940b7c73aefd143423f53cd1cd7648ccf96d32d66afb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or phishing campaign. The presence of numerous links to potentially compromised CMS uploads indicates an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/52034e16a5a30b737af01b7fa41bedd4/tixezofavifelepowur.pdf In PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/weraworavora.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a2114d8046f---59495827953.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b428c7b2d322ae0c81bc254e2250a1f8/4617595397.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89b6825f---jakivafesufe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/djqk0kfafvg436h3t4nksi0kv7/39148683294.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/75436acec0df942466d2af8a1114a14d/pufulaxabimetunapinokoxed.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/78661587112.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/174fcd793242fed89a348b74c8ba6d5a/rijibiriwo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/siguvobomimuna.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a28491c7ed8---14889453421.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pitemimarabid.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3833a4b2---gimupisajusubavizexif.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa3795c8bf---lobedaniloferigew.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fctbui62h4i76qf3pjk9v2ns84/rasojibilas.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210630100214.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gegujesekaxapoxokebuf.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zixinojowomegogumebifusi.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/jutodu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/59321084946.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4a1fab1108921aa995fa9b8425ad6493/30912655084.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vekige.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d607116f6a---jewewexotipovewej.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/tofajinuzusuminujasit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=responsibilities+of+government+to+citizensPDF 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 16508 bytes
SHA-256: 64d05614519a4b4ccfb40f89b0acceae4fa9bb0a16388529cea797328ba3915d
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 10972 bytes
SHA-256: b53c91aa36fbc2f2a990d7bcbb750508d85146027ce74d801b3d874fd42e167e

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