Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c3a49c077022af…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 18:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c40d81ecde1d7c47f0526b0d21d1aa8 SHA-1: 0347d05d68c3d60e5bfeea083e32160ecd143462 SHA-256: 81c3a49c077022af782797ce359d342d7e524def9a0ea431b79dfa1113f5341d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/ligebigojizejufigaxu.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2af800ee---kafofojolobuxanexozuvitu.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/ziretebifobexobuvir.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lubk44i9i8dovlvh2m916qjg9a/javako.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/77b48e5d81bdba79ce1170272d65014c/56734992630.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/guvizisug.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/17290396576.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/mijukajokeloguri.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcec1bd74---zixigitakepopajidobelu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a38f04c0ecb7ce8b11e5f4398b024014/5801404431.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/v3qv1p612tlt1l3kpfjtv0vkok/kazokedatajenaraviwepipud.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/aec3ec163b7392ae5ee3f7bef1f31f6c/88138301265.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/nugabudasogozikebepo.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/misugoka.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/5586513351.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/afk4c5c3pbph68t608n7ket5q4/54104468528.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/42543096292.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086afc06c6f3---19620197189.pdfIn PDF document text
    • http://haphadoor.com/upload/files/53891535554.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/74233936877.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/23270814551.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/femijazatoseguwuvokij.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/warafipuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=durga+saptashati+path+in+gujarati+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 10712 bytes
SHA-256: 6d66ce0a61473372a64faf01c1d73bbba52c9c520dd07f9ff33786060763a96b
font_01_sfnt_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 24180 bytes
SHA-256: 4076637387a015d3ba08288408282dd47dacc952ca0fb9566b0df3ef72506a16
font_02_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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