Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89450d7656234b2…

MALICIOUS

PDF

88.5 KB Created: 2021-08-11 11:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de0bc73ecb17100f300f39a09b2d5ee9 SHA-1: f418d78da3911ce1ac170247509736728bd6c5f5 SHA-256: a89450d7656234b2a0cde6125c3da308ce2f72386779ab40b4d2171b31a2569a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kapelski.pl/userfiles/file/18032880065.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107c57774c1b---93574145073.pdf
    • http://romengo.com/ckfinder/userfiles/files/tajijiba.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c70ec37350fd8e8d47a147730c6fffc9/fuxuresapimopewowij.pdf
    • https://mama-light.net/business_school/uploads/file/53255018528.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xiwiseluzexoja.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/jovobefixivovigomum.pdf
    • https://aslimitada.com/userfiles/file/jesakenoni.pdf
    • http://yejida.com/userfiles/file/50275058723.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dab5bde8d---17440144568.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/e71f5cd04104abd238da997ac63c2afb/junijinazesusalikedogudo.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7396b943e0dbeddfc46b0581bae34110/tulujekufozefagazub.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/gemuzujugarerelibu.pdf
    • http://wabasnb.com/files/fckeditor/file/115909188360b3fd4dcc8de.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbed41725---munavurajojebowugebaval.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/26199505397.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/0mp09k5flc88213o9b3jv5o6vr/40161178302.pdf
    • http://monroehighwildcats.com/clients/40160/File/luxubejexemedusun.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0e67ceae---nibiwovetulejiwaleforuvik.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fcda88f---giwuvekejibora.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/53676d827e191edadc43df03831bc060/12005735184.pdf
    • https://dolaodong.com/userfiles/file/31052700662.pdf
    • http://boek.se/bilder_umeny/File/dokujobo.pdf
    • http://skiflogistics.ru/userfiles/file/jajafepiko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=como+ser+mais+inteligente+em+tudo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35c.bin
08e8c41b43db544ed9790bd337c99f502c6ae9556a46f9faf6a8a49aee0c7c71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 18552 bytes
font_01_sfnt_off00012159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
font_02_sfnt_off00013970.bin
9e855b18d0f6987bf0a42714f521321c7ad652cfffbd6e2c7fdc008fca0e07fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 10724 bytes