Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8e4622593904e5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 22:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86304c35a8a739d58b2f3bc274b7cf36 SHA-1: 5eb0f832c12b0026cda33d52662d8f8308b88c14 SHA-256: aa8e4622593904e55b817683f4d57b1f35659517beda728184f23ea45dd6f3ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd4cc5f2f---vanokerubanisus.pdf In PDF document text
    • http://skkl.cn/filespath/files/20210909034838.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/naviv.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/gazulizini.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338a94ca6a1---fukamonapokevemu.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xajepuselipimud.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613552713ace0---30236316942.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/34265163092.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/orh4r5qd7albnujaikfjf7did6/suleneguzar.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/80103846597.pdfIn PDF document text
    • https://tekmaker.com/upload/files/wopozekepawajadad.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/88194225790.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/58739484529.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30344336444.pdfIn PDF document text
    • https://kaisar168.com/contents/files/mupibomerinevefodugazutej.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/lururimoxaxu.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/tobosur.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/vorojarinosame.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb04d4eb1e---88712382117.pdfIn PDF document text
    • http://novichiha.ru/pic/file/47294661886.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/94642182141.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jevopuxobovupesarobunamam.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/38972270239.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdd7450c2---46721663683.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/57523224313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=multi+horror+gamesPDF 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 10544 bytes
SHA-256: 4abf021582273858039eb99f6a4d652e89e06752cafba5bbce58ef8525c1a1ba
font_01_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 16664 bytes
SHA-256: 4f0595fb1f8052664565d40ce301becdb8f7504decdcb1d9e0aae7ea875784bc
font_02_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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