Malicious PDF — malware analysis report

Static analysis result for SHA-256 13415d5f55aeb444…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 23:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e4a5b5333ec0b37586019596b1d7024 SHA-1: e4bc95df67b89c2b5cf2b7a9d341892900d8e038 SHA-256: 13415d5f55aeb4442dff05e3fa5523ecd7fd1a0eaf9a46e2c2134b1be2626b5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e3932a814f9edffb4a48f04757f019ae/foxivuxedoriputiwebe.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8482999da4---bukoxaronamaxipesogebuxi.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/firasifotofutujip.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666f04dde5---4720797548.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/70306943752.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727b0cd7fdb---2954926812.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b918997f76---pimenarizudarudasipipat.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/76055855755.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zotokediboxolusufubozu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/40875dd91152ae8c54c5e718390440a4/34564558185.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wudoxin.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a83aa67a53---logolosudebuvebuniwem.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/salenuxarukeponetet.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/fukigigelobavudi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/meladowelamen.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e44b6571---42293027558.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/60118980273.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/muguzuratidatulavinulafum.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/29452262361.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b847d004795---vimojewuxelewedorud.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0199e6cb4---tonunizizebiguli.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/lq4q6pcqe4m1ermj2c9ic1q4s4/xilafaliguwebogunetexofe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/160818554718.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/caec80d6c421a92534d37b5e10def263/ladilubigazimatudesizef.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/karewu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d377eeb25---xujufogurukumelijulura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=spectra+s2+plus+electric+breast+pump+manualPDF 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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10848 bytes
SHA-256: 08113783db3fe21d870cdd2e10d50f194f6c8f8135abcbf38b04975ff6bd01c3
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 17712 bytes
SHA-256: 17526af65a81c1529ac070ae002e15adbbf9f6e44bae9db70fb6cecc2f52fd91
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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