Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f7b1e4731f7cf9…

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 00:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d669e6be634527976fb7bf5f6697698 SHA-1: 7a8d0dd241ab48c2ede3c1d1457c903557e3915a SHA-256: 90f7b1e4731f7cf92ceeea5db529016f7a0fa50eeb4bf172652180cf231d34d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the numerous links to potentially malicious sites are strong indicators of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/734b1b4f8737bc00c210e45122c7c614/29240532678.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8b905df8c0df01c993c9e6eee62b7b0b/xubojogibawabaden.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f07fa6---movosixif.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/kejejezatogov.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/suzibirebeku.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7393c9fd03eb10036cf345875e323f38/fobikiwanobedidut.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca7fa521ac---gokirokire.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa19e4a46b---63279354559.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/75816688685.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9sbfathicdde6p54g5nkblllot/83153781029.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c65b0923---94144393446.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/buwuwede.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082632650def---78312788589.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/webotudevumopibelepofimum.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933c5cce26b---61490795827.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jgeqfpp0ahtjnaaqui368l2fc1/37995355581.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0051ea4e568983bdaba4837122af96e5/piweb.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b662ec30d4---27227150812.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459c7a5c7f---gegavuru.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9f79977af2387031c9e215d84a26f854/paximexo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d68b4b00---sexij.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/jugabokujitawunazated.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/99935843668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=latest+news+quiz+questions+and+answersPDF 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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10544 bytes
SHA-256: a53c1f5f793b8cc093a901f46c3bfa4f0b11ce51d382e4ad7e56c979c67b22fa
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 17308 bytes
SHA-256: e98810b6b6f53a6d7aa9396a7dec7a483fe3569648ba778983760bd728857fbe

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