Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc9c7ccef7c092f…

MALICIOUS

PDF

104.0 KB Created: 2021-08-26 00:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c669ce7d323d6224668b4de86ec005a2 SHA-1: 95765d402f262fd6e705c118c98953d63546091e SHA-256: 3fc9c7ccef7c092fac5eb5c1cc9f1565a6c0418037540cb280529cc6a800a755
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be to serve as a lure, likely for phishing or malware distribution, by hosting numerous links that ultimately lead to further malicious downloads or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://philabc.ru/uplcv?utm_term=pyramid+building+ielts+reading+answers PDF link annotation
    • http://oletrans.sk/editor_uploads/files/82201445025.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/makinon.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/farokepimisipipase.pdfIn PDF document text
    • http://htcable.cn/d/files/33885711953.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/ragoxejiwusazurekuxu.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/30549097631.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b59f3eb022bb68781a2d2afbd7da9776/webaxo.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jopalarokumexatufu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb4daa043---kalososutimagofo.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/dolurujekazufaxer.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ec240590---92294377485.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073027f0113e---gezos.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/famesikukaxudogixapit.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210713155826375861.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/badokikemoviroro.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510095401514670tg90mg.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/sopajopefufapeve.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0c2c143534d7ec30bdfe530a5e8aa162/nenifezemekado.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a43a7c40---remulifidaposoka.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/60c3cb827b5d365bba1b01fa81344652/wifotufajiwoxowada.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c2362d08---85393029443.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/34637204162.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108171314399929.pdfIn PDF document text
    • 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_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 10912 bytes
SHA-256: 4dd8de06815c054307f19ff3d83d18caad4aee0df96f54ec9bb5020ea1d3a6a6
font_01_sfnt_off000147ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16000 18256 bytes
SHA-256: f5328f7fb8b2b1103ac112a86df8cd6e91b7a08910995b6a0bcdea550bfb44a7

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