Malicious PDF — malware analysis report

Static analysis result for SHA-256 445d4627347e7c0a…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 10:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10e36a00026f345c42203602f2c1f159 SHA-1: 88af702791c1cf8b6ed986d9c908968b80d4b28f SHA-256: 445d4627347e7c0a96fc53dffecf4e8ba834386d4ef70ed293f663c47affcd56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to various external URLs, some hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and a raw IP address literal further supports this. No scripts were extracted, but the overall structure and heuristic firings point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mkbeauty.vn/luutru/files/lotevebowuk.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1abdb9401c---nofotam.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/11857996944.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vokafovujanixudirodo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1d22f96767a5981c3aca3590c1252f07/wibutaromubobosifej.pdfIn PDF document text
    • http://stl-hk.net/userfiles/98122914925.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/mejuwunuriseroj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac865d066d---sobibexopax.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/loluropuxilekazixodubed.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/46218423594.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/44944502681.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/salulu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/37321733954.pdfPDF link annotation
    • http://ucity69.com/clients/861769/File/26509986286.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f21d41948---wibaxabalulofan.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/75109663b0134f1f31df5c205829f792/56925190172.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fozikomanedo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fabane.pdfIn PDF document text
    • http://learningkey.org/userfiles/78933067862.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa77abf37---satodel.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/kinagizukasukejasetovap.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/zabagulatuganarebawa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c78d4a5c2---57068959350.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed29180c70dde782b584e21cf21feff7/45220213566.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/43836217850.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/69604750691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=crucial+conversations+training+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 18536 bytes
SHA-256: e2596f1129babee2d68e186a7ea55a096c862f9dadd75ee87b8cbd08f8a69674
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 18052 bytes
SHA-256: 5757277a33b859b162ec710eb4d3204b195f7da73a2f104b265919e451f668cb
font_02_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C92 10992 bytes
SHA-256: 19f137285907492ea0023236a1e968b247fdfe14730a8e3bf3d5c24f3a4c9080

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