Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dad57e29467984…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 04:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9ec44ada8cc8190a20bbfae555e307e SHA-1: 9cb77212ef2a6ba985e429e9415ac95d85caee89 SHA-256: e4dad57e29467984af0789751d619df1f72bd71a29addacbab90d47aa98d5109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress sites or use disposable hosting. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, suggesting an attempt to lead victims to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://microsolder.hu/userfiles/files/wibivipatede.pdf In PDF document text
    • https://lecourbe.dk/userfiles/file/gesowoku.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/24cinsfftivn0j71hlfbsvv42o/sigubebazemofar.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/841247334c5a269831e2ac8a079c1f85/lojimopa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/065817ca953b97fe79e0e946dbf94f61/daxefobipamejotesaline.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160844568c0997---54217823239.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161135b7b89228---zimaninedizesuderejiz.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/21546927320.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/071908131780.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/13159764810.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/nizevorovunivibu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b1a104cdde0ce079f90e7fd45875de66/negozipizujilefanuvoke.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1c798ca3e---26672110545.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a801fc245d8---netiteforolalujetinudafu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7e04a79d---jafaluzumupinasudowip.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/63820506718.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/73691039188.pdfIn PDF document text
    • http://darec.sk/files/files/muteforel.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f770c97f313---51959305836.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3e4dee7d7969cd6c1d81c155b3bd6695/14549680091.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7aekmhda06mjh48lsql8alrcu0/nalaganojamarujukobefel.pdfIn PDF document text
    • http://iucecb.com/files/file/54816268183.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf645556a---66122941255.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2307b4241---gezafurajivire.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b050e819c8e---tevesopadunewudojakovej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=quantum+chemistry+ira+n+levine+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_off0000c31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 16388 bytes
SHA-256: e0c25d4103d88bba81ac8b225cf33e6ea9bea0c78ce43f77099dd1baf6e791bb
font_02_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 11104 bytes
SHA-256: 42a10e4ab89eb4fbd33c0df404973704e3bdcb8ffab238031806327791a12939

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