Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cb33715e09c9f8…

MALICIOUS

PDF

98.9 KB Created: 2021-09-02 07:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 917cf5f0295d04f081861948f48a1935 SHA-1: fc3f795f5304d9d5b7a1835ce21bb001e0a9a9b8 SHA-256: 87cb33715e09c9f883d27de16ca2f95ff035c8e3f5b86729a7429b2793597fab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 6

  • 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.
  • 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://tai-yang.tw/taiyang/upload/file/varevam.pdf In PDF document text
    • http://vhshf.de/File/jirevexaruxewo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a658792b---wufasi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc10acdaa6---kagugedapizipu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8f1617c1---13597812640.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3777f29b71d610ea8da3dcb4d782eadf/timusak.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1dddrrgsrq3b3ripqh9gknep6u/81366661442.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dotutebojarisizunak.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161218fda96d5d---75826901153.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e41f6c4259f98309b63a9db120f1ec06/mubowoxavorisow.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/werugoxituwipepuzonimu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kifisutudoravetoxarumuk.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/aebc872040b2cd724bfdd4b2923da763/kojewoxiniwirejepikif.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce1a7b4e6---fenorenuvuwebolaraguma.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e98514d7d---42701680758.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bedfbed1b9---befulafatisi.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/vatesuvenelimodu.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/favidepuragitak.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/80a4a68ea73ae7992699d60aad029ed7/75593044156.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6b149cb9---57427131001.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/kotaru.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gunilobazi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fadb56d4---84493820712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=baby+curly+tail+lizardPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10308 bytes
SHA-256: d22c65a32148c33b9c3b3b25601909283f81ac455b33487387e7c6956744ee8a
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_02_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 16124 bytes
SHA-256: 2c21ff3ceeb7a5749d3d52712a08aca31fcce6c6a030d08a19a294d8f4050a43
font_03_sfnt_off00013043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 20376 bytes
SHA-256: d7ee15d3d16766c4c3ec33e186e040c911a8b76c8bdc8e3fda73b234d8dd2bdb

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